House, Senate,
governors.

Parti démocrate — 68 % de probabilité

Raisonnement : Le parti du président sortant perd presque systématiquement des sièges à la Chambre lors des élections de mi-mandat (moyenne historique : -28 sièges depuis 1946) et les républicains n'y détiennent qu'une majorité extrêmement mince (quelques sièges seulement), ce qui abaisse drastiquement le seuil de bascule. L'absence de « vague » structurelle favorable au GOP (économie correcte, pas de guerre majeure, polarisation figée) rend le scénario historique standard — une bascule démocrate — le plus probable, même si la marge d'erreur reste significative compte tenu de la volatilité des districts pivots.

Pronostic : le Parti démocrate contrôlera la Chambre des représentants après le 3 novembre 2026, avec environ 232 sièges (fourchette 225-240), soit une probabilité de 78 %.

Justification : les élections de mi-mandat pénalisent presque toujours le parti du président, et Trump devrait rester autour de 40-45 % d’approbation avec un avantage démocrate de 5 à 8 points au vote générique. Les démocrates n’ont besoin que d’un gain net d’environ 3 sièges pour reprendre la majorité ; la dynamique nationale, les retraites républicaines et le redécoupage compensent en partie les gains républicains au Texas, ce qui rend une majorité démocrate étroite à modérée plus probable qu’une conservation républicaine.

Pronostic : le Parti démocrate — probabilité estimée : 65 %.

Le parti du président sortant perd des sièges à la Chambre dans 19 des 21 midterms depuis 1945, et les républicains ne disposent après 2024 que d'une marge d'environ trois sièges : les démocrates n'ont donc besoin que d'un gain net minime pour basculer la chambre. Les élections partielles de 2025 ont montré une surperformance démocrate significative (environ 10-20 points de swing dans plusieurs circonscriptions), et ce scrutin fonctionnera comme un référendum sur Donald Trump, dont l'approbation chez les indépendants est structurellement fragile. Les principaux facteurs pouvant inverser ce pronostic : une amélioration économique sensible d'ici novembre 2026, des redécoupages favorables aux républicains, ou une dynamique d'immigration qui mobilise la base GOP — d'où une probabilité de 65 % et non 80 %.

Parti attendu : Parti démocrate.
Probabilité estimée : 65 %.

Raisonnement : Historiquement, le parti d'opposition récupère en moyenne une quinzaine de sièges lors des premières élections de mi-mandat d'un président, ce qui avantage structurellement les démocrates face à la très courte majorité républicaine actuelle. Les sondages génériques et l'usure naturelle du pouvoir exécutif confirment cette dynamique, bien que les récentes batailles de redécoupage des circonscriptions (redistricting) puissent réduire l'ampleur du basculement.

Pronostic : Parti républicain contrôle la Chambre des représentants avec environ 218 sièges, probabilité de 55 %. Justification : Les élections de mi-mandat penchent traditionnellement contre le parti présidentiel, et malgré une présidence démocrate en fonction, le contexte économique actuel et les historiques de participation favorisent le parti opposé. De plus, le redécoupage électoral post-2020 maintient une légère advantage structurelle républicaine dans plusieurs districts clés, bien que la dynamique locale et les candidatures indépendantes puissent resserrer le résultat.

Parti républicain (GOP) – 70 % de probabilité

La carte électorale 2026 est structurellement très défavorable aux démocrates, qui doivent défendre des sièges dans des États solidement républicains (Montana, Ohio, Virginie-Occidentale) ou très compétitifs (Pennsylvanie, Michigan, Wisconsin, Nevada, Arizona). L'histoire des midterms (avantage au parti hors Maison Blanche) et l'actuel désavantage de popularité du parti présidentiel renforcent mécaniquement les chances d'une bascule, même si la qualité des candidats et l'économie feront varier l'ampleur de la majorité.

Pronostic : le Parti républicain conservera le contrôle du Sénat après le 3 novembre 2026, avec environ 52 sièges républicains contre 48 démocrates/indépendants caucusant avec les démocrates (majorité à 51). Probabilité : 78 %.

Justification : la carte électorale de 2026 est structurellement favorable aux républicains, car les démocrates défendent 13 sièges de classe II, dont plusieurs potentiellement contestés (Géorgie, Michigan, New Hampshire), et doivent gagner quatre sièges nets pour atteindre 51. Leurs seules cibles réalistes sont la Caroline du Nord, où un gain démocrate est probable, et le Maine, où Susan Collins reste difficile à battre ; même avec la Caroline du Nord, les républicains gardent l’avantage. L’environnement de mi-mandat peut aider les démocrates, mais pas assez pour compenser une carte où très peu de sièges républicains sont réellement en jeu.

Pronostic : le Parti républicain conservera le contrôle du Sénat, avec une probabilité estimée à environ 78 %.

Raisonnement : La carte électorale de 2026 (classe 2) est structurellement très favorable aux républicains : partis d'une majorité de 53 sièges, les démocrates devraient réaliser un gain net de 4 sièges pour atteindre 51, un 50-50 profitant au vice-président républicain comme président du Sénat. Or les démocrates défendent plusieurs sièges dans des États remportés par Trump en 2024 (Géorgie, Michigan, Minnesota, New Hampshire, New Jersey), tandis que leurs cibles crédibles côté républicain se limitent essentiellement au Maine (Susan Collins), à la Caroline du Nord et, dans un scénario optimiste, au Texas et à l'Iowa. Même en intégrant le penalty électoral habituel du parti au pouvoir lors des midterms, cette arithmétique rend une bascule démocrate improbable — sans l'exclure totalement en cas d'onde de choc nationale liée à la popularité de Trump.

Parti attendu : Parti démocrate.
Probabilité : 65 %.

Raisonnement : La carte sénatoriale de 2026 est structurellement très défavorable aux républicains, ceux-ci devant défendre une dizaine de sièges dans des États penchant à gauche (Maine, Pennsylvanie, Wisconsin, Ohio) tandis que les démocrates ne protègent que trois États véritablement compétitifs (Géorgie, Nevada, New Hampshire). De surcroît, l'historique des mi-mandats indique qu'avec un président républicain élu en 2024, la sanction habituelle frappera son parti, offrant aux démocrates les 3 à 4 sièges nécessaires pour reconquérir la majorité.

Pronostic : Parti républicain contrôle le Sénat avec 51 sièges. Probabilité : 65 %.

Justification : La carte sénatoriale 2026 place les démocrates en défense dans plusieurs États remportés par Trump en 2020 (Montana, Ohio, Virginie‑Occidentale), ce qui leur est défavorable. Historiquement, le parti présidentiel perd des sièges lors des premières élections de mi‑mandat, et la dynamique actuelle des sondages nationaux et étatiques penche en faveur de l'opposition. La structure électorale du Sénat, où les démocrates doivent protéger 10 sièges dans des États penchant à droite, renforce les chances républicaines d'atteindre la majorité de 51.

Prédiction : 53 sièges Républicains – 47 sièges Démocrates (Probabilité : 65 %)

Raisonnement : La carte 2026 est structurellement désastreuse pour les Démocrates qui doivent défendre 13 sièges contre seulement 2 pour les Républicains, avec plusieurs sortants vulnérables dans des États remportés par Trump (Montana, Ohio, Pennsylvanie, Michigan, Wisconsin, Nevada, Arizona, Géorgie). L'histoire des midterms (penalité du parti présidentiel) et l'environnement probable favorable au GOP en 2026 rendent un gain net de 3 à 4 sièges pour les Républicains le scénario central, ne laissant qu'une marge étroite pour un statu quo si la qualité des candidats républicains déçoit (scénario ~25 %).

Pronostic central : 53 républicains, 47 démocrates et indépendants caucusant avec eux (Sanders, King). Probabilité de cette répartition exacte : 32 %. Probabilité d’une majorité républicaine : environ 88 %.

Distribution probable : 53–47 R (32 %), 54–46 R (27 %), 52–48 R (18 %), 55–45 R (9 %), 51–49 R (7 %), autres scénarios dont 50–50 et majorité démocrate (7 %).

Justification : la carte reste structurellement favorable aux républicains, avec

Pronostic : le Parti républicain conserve le Sénat avec environ 54 sièges contre 46 pour les démocrates (fourchette probable : 52–56 R). Probabilité estimée de contrôle républicain : ~85 %.

Raisonnement : La carte électorale de 2026 est structurellement l'une des pires pour les démocrates depuis des décennies : 20 sièges républicains en jeu (quasi tous dans des États profondément rouges) contre 13 sièges démocrates, dont quatre ouvertures vulnérables (Géorgie, Michigan, Minnesota, New Hampshire) dans des États compétitifs. Le scénario central est un gain républicain en Géorgie face à Jon Ossoff, le sortant démocrate le plus exposé, tandis qu'un contrecoup anti-Trump en mi-mandat pourrait permettre aux démocrates de tenir leurs sièges et de viser le Maine (Collins) ou la Caroline du Nord (Tillis) — mais leur chemin vers la majorité exigerait un net +4, quasi impossible sur cette carte.

*Incertitude assumée : ce pronostic repose sur la configuration connue à ce jour ; des candidatures fortes, des primaires chaotiques (Texas, Caroline du Nord) ou une vague électorale nationale pourraient déplacer le résultat de 2 à 3 sièges dans un sens comme dans l'autre.*

The user wants a precise, quantified prediction (a "pronostic") about the US Senate seat distribution after the 2026 midterm elections (November 3, 2026).
I need to act as a rigorous political analyst.
Constraints:
- Respond in French.
- Be direct.
- Name the expected candidate/party (here, which party will control the Senate and the seat distribution).
- Give an estimated probability in percentage.
- Explain reasoning in 2-3 sentences.
- Do not refuse to predict.

Let's analyze the 2026 US Senate map.
In 2026, the Class 3 Senators are up for election.
There are 33 Class 3 seats up for election (plus potentially special elections, but let's stick to the regular map).
In the 2024 elections, the Republicans won the Senate majority (they will have 53 seats assuming current trends/results, or 52/53 depending on final counts, let's say 53 R, 47 D after 2024).
Wait, let's look at the 2026 map.
Republicans defending in 2026:
- Maine (Collins) - tossup/slightly R
- North Carolina (Tillis) - tossup
- Ohio (Moreno) - lean R
- Iowa (Grassley) - safe R
- Kansas (Marshall) - safe R
- Alaska (Sullivan) - lean R
- Texas (Cornyn) - safe R
- Florida (Scott) - safe R
- Alabama (Tuberville) - safe R
- Arkansas (Boozman) - safe R
- Idaho (Risch) - safe R
- Kentucky (Paul) - safe R
- Louisiana (Cassidy) - lean R
- Oklahoma (Lankford) - safe R
- South Carolina (Graham) - lean R
- South Dakota (Thune) - safe R
- Utah (Lee) - lean R
- Wyoming (Barrasso) - safe R

Democrats defending in 2026:
- Georgia (Ossoff) - tossup
- Michigan (Slotkin) - lean D
- Minnesota (Smith) - lean D
- New Hampshire (Shaheen) - lean D
- Arizona (Kelly) - lean D
- Colorado (Bennet) - safe D
- Connecticut (Blumenthal) - safe D
- Hawaii (Hirono) - safe D
- Maryland (Van Hollen) - safe D
- Nevada (Rosen) - tossup/lean D
- New Mexico (Heinrich) - safe D
- New York (Schumer) - safe D
- Oregon (Wyden) - safe D
- Rhode Island (Reed) - safe D
- Vermont (Welch) - safe D
- Virginia (Kaine) - lean D
- Washington (Cantwell) - safe D
- California (Padilla) - safe D
- Illinois (Durbin) - safe D
- Massachusetts (Warren) - safe D
- New Jersey (Booker) - safe D
- Pennsylvania (McCormick - R, wait, PA is Class 1, not up in 2026. Let me check. 2026 is Class 3. PA Senator is Dave McCormick (R), elected 2024, Class 1? No, Bob Casey was Class 1. Wait. Bob Casey was elected 2018, 2012, 2006. Class 1 is 2018, 2024, 2030. So PA is not up in 2026.
Let's check Wisconsin: Tammy Baldwin is Class 1 (elected 2012, 2018, 2024). Not up in 2026.

So in 2026, Democrats have to defend:
Tossups/Lean R: Georgia (Ossoff), maybe Nevada (Rosen).
Republicans have to defend:
Maine (Collins), North Carolina (Tillis).

Historically, the President's party loses seats in midterms. If Trump is President (Republican), Democrats usually gain seats in 2026.
However, the map is quite favorable to Republicans in terms of absolute numbers, but the competitive seats are roughly balanced.
If Republicans have 53 seats after 2024.
Democrats need to net +4 to win the majority (53-47 -> 50-50 with VP, or 51-49).
Given the midterm penalty for the incumbent President's party, Democrats have a good chance to flip Maine and North Carolina, and hold Georgia and Nevada. That would be a net +2 for Democrats (if they flip 2 R seats and hold their own). That gets them to 49. If they also flip a seat like Ohio or Iowa (unlikely but possible in a wave), they get 50 or 51.
Actually, let's look at the 2026 map again.
Republican seats up: 20 (including 2 tossups: ME, NC).
Democrat seats up: 13 (including 2 tossups: GA, NV).
Wait, 20 + 13 = 33. Correct.
If Dems flip ME and NC (+2), and hold GA and NV (0), they go from 47 to 49. Reps go from 53 to 51.
If Dems flip ME, NC, and one more (say, a surprise in TX or FL or OH, or hold all and flip a 3rd), they get 50 or 51.
Given the typical midterm swing against the president's party (average ~4-5 seats in Senate historically, though map dependent), and the fact that the 2024 map was brutal for Dems (they lost WV, MT, OH, PA), the 2026 map is much better for Dems.
Therefore, the most likely outcome is that Democrats regain the Senate majority, or at least make massive gains.
Let's predict: Democrats take the Senate with 51 seats (Republicans 49).
Probability: 55% chance Democrats win majority. Or specifically, 51-49 D majority is the modal outcome.
Let's frame it as: "Les démocrates remporteront le contrôle du Sénat avec environ 51 sièges contre 49 aux républicains."
Probability: 60% (or 55%).
Reasoning:
1. The 2026 map forces Republicans to defend vulnerable seats in blue-leaning states (Maine, North Carolina) while Democrats mostly defend safe or swing states (Georgia, Nevada), and the historical midterm penalty against the president's party (Trump) strongly favors a Democratic wave.
2. Assuming a typical midterm swing, Democrats are well-positioned to flip the two most competitive Republican seats and hold their own, netting the four seats needed to secure a narrow majority.

Let's refine the numbers.
Current (post-2024): Republicans 53, Democrats 47 (independents caucus with Dems).
If Dems flip ME (Collins) and NC (Tillis) -> 49 D, 51 R.
If Dems also flip one more, say Georgia stays D, NV stays D, and they flip a 3rd? No, to get 51, they need +4.
Wait. 47 + 4 = 51.
To get +4, they need to flip 4 Republican seats and lose 0, OR flip 5 and lose 1, etc.
Republican seats: ME, NC are the only true tossups.
Other Republican seats: Ohio (Moreno), Iowa (Grassley - retiring maybe, but safe R), Texas (Cornyn), Florida (Scott).
If there is a massive blue wave, Dems could flip ME, NC, and maybe Ohio or Texas (if Cornyn primaried and weakened). But typically, a +4 Senate gain requires a wave.
Actually, in 2026, the number of Republican seats up is 20, Democrat seats up is 13.
If Dems lose 0 and flip 4, they get 51.
If they flip ME, NC, and 2 others (e.g., OH, TX or IA), they get 51.
Is a +4 gain likely? 2018 was +2 for Dems. 2006 was +6 for Dems. 2010 was +6 for Reps. 2022 was -1 for Reps (Dems gained 1).
Given the map, a +4 is plausible if there's a wave.
Alternatively, maybe Republicans hold with 51-49 or 52-48 because the map, despite ME and NC, has 20 R seats vs 13 D seats, meaning Dems have fewer targets.
Let's look at the math: Dems have 13 seats up. If they lose GA and NV (2 seats), they are at 45. They would need to flip 6 Rep seats to get 51. That's very hard.
If they hold GA and NV, they are at 47. They need to flip 4 Rep seats.
The only Rep seats realistically in play are ME, NC, maybe OH, maybe TX (if Cornyn loses primary to a far-right candidate who is weaker in general, or if there's a scandal), maybe FL (Scott is wealthy but beat Crist by 13pts in 2022, so safe).
So Dems flipping 4 is a stretch but possible in a wave.
What if the prediction is: Republicans retain the Senate, 51-49?
Let's check handicappers. Usually, early handicaps for 2026 say Republicans are slight favorites to hold because of the 20-13 map, but the presidency penalty makes it close.
Actually, if Republicans have 53, and Dems flip ME and NC (2 seats), Reps are at 51, Dems at 49. That's a very likely baseline (Dems flip the two tossups, hold everything else).
To get to 50-50, Dems need to flip one more (e.g., Ohio or a special election).
To get 51-49, Dems need to flip one more after that.
So the most likely single outcome might be Republicans hold 51-49, OR Democrats take 50-50 / 51-49.
Let's give a direct prediction: "Les républicains conserveront le contrôle du Sénat avec une majorité réduite de 51 sièges contre 49 aux démocrates."
Probability: 55%.
Reasoning:
Le calendrier électoral de 2026 est structurellement défavorable aux démocrates puisqu'ils ne défendent que 13 sièges contre 20 pour les républicains, limitant leurs cibles de conquête malgré le traditionnel vote de sanction contre le parti du président (Trump). Les démocrates parviendront vraisemblablement à reprendre le Maine et la Caroline du Nord, mais échoueront à basculer les sièges supplémentaires nécessaires pour obtenir la majorité absolue.

Wait, let's re-verify the 2026 Senate map.
Class 3 Senators:
Republicans (20):
Alaska (Sullivan)
Alabama (Tuberville)
Arkansas (Boozman)
Florida (Scott)
Georgia (Ossoff is Dem, wait. Perdue was Rep, Ossoff is Dem. So GA is Dem up in 2026. Correct.)
Idaho (Risch)
Iowa (Grassley)
Kansas (Marshall)
Kentucky (Paul)
Louisiana (Cassidy)
North Carolina (Tillis)
Ohio (Brown lost, Moreno is Rep. So OH is Rep up in 2026. Correct.)
Oklahoma (Lankford)
South Carolina (Graham)
South Dakota (Thune)
Texas (Cornyn)
Utah (Lee)
Wyoming (Barrasso)
Maine (Collins)
Total R up: 20.

Democrats (13):
Arizona (Kelly)
California (Padilla)
Colorado (Bennet)
Connecticut (Blumenthal)
Georgia (Ossoff)
Hawaii (Hirono)
Maryland (Van Hollen)
Nevada (Rosen)
New Hampshire (Shaheen)
New York (Schumer)
Oregon (Wyden)
Rhode Island (Reed)
Virginia (Kaine)
Washington (Cantwell)
Vermont (Welch)
Illinois (Durbin)
Massachusetts (Warren)
New Jersey (Booker)
Pennsylvania (McCormick is Rep, but Class 1, not up)
Wait, I counted 13 above, but listed 19 here. Let's recount.
Class 3 terms end in 2027 (elected 2020, 2014, 2008, etc.)
Let's list Class 3 Senators exactly:
AL: Tuberville (R)
AK: Sullivan (R)
AZ: Kelly (D)
AR: Boozman (R)
CA: Padilla (D)
CO: Bennet (D)
CT: Blumenthal (D)
DE: Carper (D) - retiring, D hold. (I missed DE!)
FL: Scott (R)
GA: Ossoff (D)
HI: Hirono (D)
ID: Risch (R)
IL: Durbin (D)
IN: Young (R) - missed IN!
IA: Grassley (R)
KS: Marshall (R)
KY: Paul (R)
LA: Cassidy (R)
MA: Warren (D)
MD: Van Hollen (D)
MO: Blunt (R) - retired, Hawley is Class 1. Wait, MO Senator in 2026? Blunt retired in 2022. So MO is Class 1 (Hawley). Not up in 2026.
ME: Collins (R)
MI: Stabenow (D) - retired, Slotkin is Class 1? No, Stabenow was Class 1 (elected 2018). Wait. Stabenow elected 2000, 2006, 2012, 2018. That's Class 1! So MI is not up in 2026. (Slotkin is Class 1, elected 2024).
MN: Franken (resigned), Smith (D) - Smith elected 2018 special, 2020, 2026. So MN is Class 2? Wait. Smith was appointed in 2018 to fill Franken's seat (Class 2, term ends 2020). Then elected to full term in 2020 (Class 2, ends 2026). So MN is NOT up in 2026. (Class 2 is up in 2026? No, Class 2 was up in 2020 and 2022 (specials) and will be up in 2026? Wait.
US Senate classes:
Class 1: terms end 2019, 2025, 2031. (Elected 2018, 2024, 2030)
Class 2: terms end 2021, 2027, 2033. (Elected 2020, 2026, 2032)
Class 3: terms end 2023, 2029, 2035. (Elected 2022, 2028, 2034)
WAIT. The 2024 election was for Class 1.
The 2026 election is for Class 2!
Ah! Midterms are always Class 2!
Let me correct this. 2026 is a midterm year. Midterms are Class 2.
Class 2 Senators:
Terms end in 2027. Elected in 2020 (and some specials in 2022/2024 to finish terms).
Let's list Class 2 seats up in 2026:
Alabama (Tuberville - R) - wait, Tuberville elected 2020, so Class 2. Yes.
Alaska (Sullivan - R) - elected 2014, 2020. Class 2. Yes.
Arizona (Kelly - D) - elected 2020 special (to finish McCain's class 3? No, McCain was Class 1? McCain elected 1986, 1992, 1998, 2004, 2010. 1986+6=1992. Class 1. So Kelly finished Class 1 term, then elected full Class 1 term in 2022. So Kelly is Class 1, NOT up in 2026.)
Let's properly identify Class 2 (up in 2026):
Class 2 Senators (elected 2020, or specials in 2022/2024 for terms ending 2027):
- Alabama: Tommy Tuberville (R)
- Alaska: Dan Sullivan (R)
- Arkansas: Tom Cotton (R) - elected 2014, 2020. Class 2.
- Colorado: John Hickenlooper (D) - elected 2020. Class 2.
- Delaware: Chris Coons (D) - elected 2010, 2014 special, 2020. Class 2.
- Georgia: Raphael Warnock (D) - elected 2020 special (to finish Isakson's Class 2 term), then 2022 full term. Wait. Isakson was Class 2 (elected 2004, 2010, 2016). So Warnock is Class 2, up in 2026? No, Warnock won the full term in 2022, which is a Class 2 term ending in 2028! So Warnock is NOT up in 2026. (2022 was Class 3 and special Class 2).
Let's use the standard 2026 Senate map from election handicappers (e.g., Sabato, Cook Political Report).
The 2026 Senate map (33 seats):
Republicans defending (21 seats?):
- Alabama (Tuberville)
- Alaska (Sullivan)
- Arkansas (Cotton)
- Florida (Rubio - elected 2010, 2016, 2022. Wait, Rubio is Class 3? Rubio elected 2010. 2010+6=2016. Class 3. So Rubio NOT up in 2026. Class 3 was up in 2024. So 2024 was Class 1. 2026 is Class 2. 202

Préiction : Les Républicains remporteront 51 sièges au Sénat, les Démocrates 49 (incluant 2 indépendants qui votent avec eux), avec une probabilité de 65 % que les républicains obtiennent la majorité. Justification : La dynamique historique des midterms du premier mandat présidentiel joue traditionnellement contre la Maison Blanche, et l'environnement électoral actuel favorise les républicains dans les États clés comme le Montana, l'Ohio et la Virginie-Occidentale où les démocrates défendent des sièges étroits. Les sondages récents dans ces États montrent des écarts serrés ou favorables aux challengers républicains, tandis que la structure du Sénat 2026 impose aux démocrates de défendre un nombre disproportionné de sièges dans des États remportés par Trump en 2024.

Parti républicain (GOP) – 65 % de probabilité

Raisonnement : La dynamique historique du « midterm penalty » pénalise presque systématiquement le parti présidentiel (ici les Républicains avec Trump), mais la carte 2026 est exceptionnellement favorable au GOP : les Démocrates doivent défendre 7 à 8 sièges « Toss-up » ou « Lean D » dans des États pivots ou rouges (MI, WI, KS, AZ, NC, NV, NH), tandis que les Républicains n'ont quasi aucune exposition dans des États bleus (seulement VT et NH). La qualité des candidats et l'économie feront varier le score, mais l'arithmétique structurelle donne un net avantage aux Républicains pour remporter la majorité des 36 postes en jeu (pronostic ~20-22 contre ~14-16).

Je prédis que le Parti républicain remportera le plus de postes de gouverneur le 3 novembre 2026, avec une probabilité d’environ 90 %. Solde net central : Républicains +2 (de 27 à 29), Démocrates -2 (de 23 à 21) ; probabilité d’environ 40 % pour ce solde exact, avec une fourchette probable de +1 à +3 pour les Républicains. Les Démocrates défendent plusieurs sièges ouverts ou fragiles — Kansas quasi perdu, Michigan toss-up, Maine et Nouveau-Mexique plus favorables aux D — tandis que leurs occasions de gain chez les Républicains se limitent surtout au New Hampshire et restent moins nombreuses ; la carte et la structure des États rouges compensent la dynamique de mi-mandat contre le parti présidentiel. Scénario alternatif : si le Michigan tient pour les Démocrates, R +1 ; si le Maine ou le Wisconsin bascule aussi, R +3.

The user is asking me to predict which party will win the most governorships in the November 3, 2026 US midterm elections. The system prompt instructs me to be a rigorous political analyst, give a specific prediction with a percentage probability, and explain my reasoning in 2-3 sentences. I should not refuse to predict.

Let me think about the 2026 gubernatorial elections. Which states have gubernatorial elections in 2026?

The 36 or so governorships up in 2026... Actually, let me recall. Gubernatorial elections happen in 36 states in midterm years typically, but the exact list varies. In 2026, the states with gubernatorial elections include:

- Alabama (Kay Ivey - R, may run again or open seat)
- Alaska (open - Dunleavy term-limited)
- Arizona (Katie Hobbs - D, running for re-election)
- Arkansas (Sarah Huckabee Sanders - R)
- California (Gavin Newsom term-limited - open seat)
- Colorado (Jared Polis term-limited - open seat)
- Connecticut (Ned Lamont - D)
- Florida (Ron DeSantis term-limited - open seat)
- Georgia (Brian Kemp term-limited - open seat)
- Hawaii (Josh Green - D)
- Idaho (Brad Little - R)
- Illinois (JB Pritzker - D, possibly running for president)
- Iowa (Kim Reynolds - R)
- Kansas (Laura Kelly - D, term-limited - open seat)
- Maine (Janet Mills - D, term-limited - open seat)
- Maryland (Wes Moore - D)
- Massachusetts (Maura Healey - D)
- Michigan (Gretchen Whitmer term-limited - open seat)
- Minnesota (Tim Walz - D)
- Nebraska (Jim Pillen - R)
- Nevada (Joe Lombardo - R)
- New Hampshire (open - Sununu retired? Actually Chris Sununu is not running... wait, 2026 NH governor - Kelly Ayotte won in 2024, so she's up in 2026? No wait. New Hampshire elects governors every 2 years. Kelly Ayotte was elected in November 2024, so she's up for re-election in 2026.)
- New Mexico (open - Lujan Grisham term-limited)
- New York (Kathy Hochul - D)
- North Dakota (open - Burgum... actually Armstrong elected 2024? No, Kelly Armstrong was elected in 2024, so not up in 2026. Wait, North Dakota elected a governor in 2024 - Kelly Armstrong. So not up in 2026.)
- Ohio (Mike DeWine term-limited - open seat)
- Oklahoma (Kevin Stitt term-limited - open seat)
- Oregon (Tina Kotek - D)
- Pennsylvania (Josh Shapiro - D)
- Rhode Island (open - Dan McKee? He may run)
- South Carolina (Henry McMaster term-limited - open seat)
- South Dakota (Larry Rhoden - R, appointed/succeeded Noem)
- Tennessee (Bill Lee term-limited - open seat)
- Texas (Greg Abbott - R, could run for 4th term? Texas has no term limits for governor)
- Vermont (Phil Scott - R, may run again or retire)
- Wisconsin (Tony Evers - D, may or may not run)

So roughly 36 states. Currently, of these, the partisan breakdown: Republicans hold roughly 22-24 of the seats up in 2026, Democrats hold roughly 12-14.

Let me count more carefully. States up in 2026 and current party:

Republican-held:
1. Alabama (Ivey)
2. Alaska (open, Dunleavy R term-limited)
3. Arkansas (Sanders)
4. Florida (open, DeSantis term-limited)
5. Georgia (open, Kemp term-limited)
6. Idaho (Little)
7. Iowa (Reynolds)
8. Nebraska (Pillen)
9. Nevada (Lombardo)
10. New Hampshire (Ayotte)
11. North Dakota - not up (elected 2024)
12. Ohio (open, DeWine term-limited)
13. Oklahoma (open, Stitt term-limited)
14. South Carolina (open, McMaster term-limited)
15. South Dakota (Rhoden)
16. Tennessee (open, Lee term-limited)
17. Texas (Abbott)
18. Vermont (Scott)

That's about 17-18 Republican-held seats up.

Democrat-held:
1. Arizona (Hobbs)
2. California (open, Newsom term-limited)
3. Colorado (open, Polis term-limited)
4. Connecticut (Lamont)
5. Hawaii (Green)
6. Illinois (Pritzker)
7. Kansas (open, Kelly term-limited)
8. Maine (open, Mills term-limited)
9. Maryland (Moore)
10. Massachusetts (Healey)
11. Michigan (open, Whitmer term-limited)
12. Minnesota (Walz)
13. New Mexico (open, Lujan Grisham term-limited)
14. New York (Hochul)
15. Oregon (Kotek)
16. Pennsylvania (Shapiro)
17. Rhode Island (McKee)
18. Wisconsin (Evers)

That's about 18 Democratic-held seats up.

So it's roughly 18-18 or so. Actually the total is 36 governorships up in 2026.

Now, which party is likely to win more? Key considerations:

1. Midterm elections typically favor the party out of power (the party not holding the presidency). In 2026, Republicans hold the presidency (Trump). So historical patterns suggest a Democratic wave or at least Democratic gains.

2. However, gubernatorial races are more state-specific and less nationalized than Senate/House races. Popular incumbent governors of either party often win re-election.

3. Key competitive races:
- Arizona: Hobbs (D) is vulnerable, but Arizona has trended... 2024 went for Trump. This could flip to R.
- Georgia: open seat, Democrats (Abrams is done, but maybe others) vs. strong R bench. Georgia has been competitive but R-leaning in federal races. Likely R hold, but D could win with a strong candidate.
- Michigan: open seat, likely competitive but Michigan has elected Dems statewide recently (Whitmer won twice, Slotkin won Senate 2024). Toss-up.
- Kansas: open seat in a red state - likely R pickup.
- Wisconsin: Evers may retire; open seat in a 50-50 state. Toss-up.
- Maine: open seat, Mills was popular; Maine is blue-ish but has elected R governors (LePage). Lean D.
- Nevada: Lombardo (R incumbent) in a state that went for Trump 2024 but has D senators. Toss-up/lean R.
- New Hampshire: Ayotte (R) in a state that swung D in 2024 federal races. Toss-up.
- Vermont: Scott (R) very popular; if he retires, likely D pickup.
- Ohio: open seat, red state, likely R.
- California: open seat, likely D (though some R candidates like... it's a jungle primary; likely D).
- Texas: Abbott likely runs again or R successor; likely R.

4. The 2026 political environment: Trump's approval ratings, economy, etc. As of my knowledge, there's significant Democratic enthusiasm, low Trump approval in many polls, and historical midterm backlash. But gubernatorial races are less nationalized.

5. Counting: Republicans currently hold more governorships overall (27 R vs 23 D). Of the 36 up in 2026, it's roughly split. Let me recount.

Actually, let me be careful. The 2026 gubernatorial map: 36 states. Let me list all 36:

1. Alabama - R
2. Alaska - R (open)
3. Arizona - D
4. Arkansas - R
5. California - D (open)
6. Colorado - D (open)
7. Connecticut - D
8. Florida - R (open)
9. Georgia - R (open)
10. Hawaii - D
11. Idaho - R
12. Illinois - D
13. Iowa - R
14. Kansas - D (open)
15. Maine - D (open)
16. Maryland - D
17. Massachusetts - D
18. Michigan - D (open)
19. Minnesota - D
20. Nebraska - R
21. Nevada - R
22. New Hampshire - R
23. New Mexico - D (open)
24. New York - D
25. Ohio - R (open)
26. Oklahoma - R (open)
27. Oregon - D
28. Pennsylvania - D
29. Rhode Island - D
30. South Carolina - R (open)
31. South Dakota - R
32. Tennessee - R (open)
33. Texas - R
34. Vermont - R
35. Wisconsin - D
36. Wyoming? No, Wyoming elected governor in 2022 (Gordon), so not up until 2026? Wait, Wyoming's gubernatorial terms are 4 years, elected in midterms. Gordon was elected 2018, re-elected 2022, so next is 2030. Not up.

Hmm, what about Indiana? Indiana elected Braun in 2024, so not up in 2026. Missouri? Kehoe elected 2024, not up. North Dakota? Armstrong elected 2024, not up. Utah? Cox elected 2024, not up. Washington? Ferguson elected 2024, not up. Delaware? Meyer elected 2024, not up. Missouri, Montana (Gianforte elected 2024). North Carolina (Stein elected 2024). Oregon? Kotek elected 2022, up in 2026. Vermont - Scott elected 2022, up 2026. New Hampshire - 2-year terms, Ayotte elected 2024, up 2026. Vermont is 2-year terms, Scott elected 2024, up 2026.

So the count: R-held up in 2026: Alabama, Alaska, Arkansas, Florida, Georgia, Idaho, Iowa, Nebraska, Nevada, New Hampshire, Ohio, Oklahoma, South Carolina, South Dakota, Tennessee, Texas, Vermont = 17.

D-held up in 2026: Arizona, California, Colorado, Connecticut, Hawaii, Illinois, Kansas, Maine, Maryland, Massachusetts, Michigan, Minnesota, New Mexico, New York, Oregon, Pennsylvania, Rhode Island, Wisconsin = 18.

Total 35. Hmm, that's 35, not 36. Maybe I'm missing one. Possibly... let me think. 2022 had 36 governorships. 2026 should also have 36. Which one am I missing?

2022 gubernatorial elections: 36 states. Let me list: AL, AK, AZ, AR, CA, CO, CT, FL, GA, HI, ID, IL, IA, KS, ME, MD, MA, MI, MN, NE, NV, NH, NM, NY, OH, OK, OR, PA, RI, SC, SD, TN, TX, VT, WI, WY... that's 36 with Wyoming? No wait, Wyoming was 2022 (Gordon re-elected). Yes! Wyoming IS up in 2026. Gordon was elected 2018, re-elected 2022, so he's up in 2026 (or term-limited - Wyoming has term limits of 8 years, so Gordon can't run in 2026; it's an open seat). So Wyoming - R (open) makes 36.

So: 18 R-held, 18 D-held up in 2026. Interesting - a perfectly split map.

Now, prediction. Which party wins more of these 36?

Solid R: Alabama, Alaska (lean R), Arkansas, Florida (lean R, open but R-favored), Georgia (lean R), Idaho, Iowa, Nebraska, Ohio (lean R), Oklahoma, South Carolina, South Dakota, Tennessee, Texas, Wyoming. That's ~15.

Competitive R-held: Nevada (toss-up), New Hampshire (toss-up), Vermont (if Scott retires, lean D; if he runs, R).

Solid D: California (likely D despite jungle primary), Colorado (lean D), Connecticut, Hawaii, Illinois, Maryland, Massachusetts, Minnesota (lean D), New Mexico, New York, Oregon, Pennsylvania, Rhode Island. That's ~13.

Competitive D-held: Arizona (toss-up, maybe lean R given 2024 Trump win), Kansas (open, lean R pickup), Maine (open, lean D), Michigan (open, toss-up), Wisconsin (toss-up, Evers may retire).

So let's tally likely outcomes in a neutral environment:
- R solid/lean: ~15 + Kansas pickup + maybe Arizona flip + Nevada hold + NH hold = ~19
- D solid/lean: ~13 + Maine + Michigan + Wisconsin = ~16
- Vermont: depends on Scott.

So in a neutral environment, Republicans might win ~19-20, Democrats ~16-17. Republicans would win more seats.

But in a Democratic wave environment (which midterms against an unpopular president often produce), Democrats could flip Arizona (hold), Georgia (pickup), Nevada... wait Nevada is R-held, D pickup possible, New Hampshire (D pickup), Ohio (less likely), Florida (less likely), Texas (unlikely), and hold all their own. In a strong D wave: D could win 20+.

Historical gubernatorial midterm patterns: In 2018 (Trump's first midterm), Democrats netted +7 governorships (won 20 of 36). In 2022 (Biden's midterm), Republicans slightly gained. In 2010 (Obama's midterm), Republicans netted +6. So the out-party typically gains governorships.

Given Trump's unpopularity in 2025 polls (approval in low 40s/high 30s), the 2026 environment likely favors Democrats. But the map is split evenly, and many R-held seats are in deep-red states that won't flip regardless.

Key question: will Democrats win more than 18 of the 36? They need to net at least +1 relative to current split (18-18) to win "the most." Actually to win the most they need 19+.

Democratic paths: Hold all 18 (Arizona is the most vulnerable D-held; Hobbs won narrowly in 2022 and Arizona swung right in 2024, though Gallego won the Senate race). Then flip at least one R-held seat: best targets are Vermont (if Scott retires), New Hampshire, Nevada, Georgia, and dark horses like Ohio, Florida, Texas (unlikely).

Republican paths: Hold their 18 (Nevada and NH are vulnerable) and flip at least one D-held: best targets are Arizona, Kansas (open, likely R pickup), Michigan (open), Wisconsin (open if Evers retires).

Kansas is probably the most likely flip in either direction - an open D seat in a state Trump won by ~15 points. So Republicans have a slight structural edge.

But the national environment matters. If 2026 is a Democratic wave (like 2018 or 2006), Democrats could overcome this. Current indicators (as of my knowledge cutoff in early 2025): Trump's approval was around 47-50% early in his term, actually not terrible. But by mid-2025, his approval declined to low 40s. Special elections in 2025 showed significant Democratic overperformance. The Wisconsin Supreme Court race in April 2025 showed a big D win. The 2025 Virginia and New Jersey governor races: Virginia went D (Spanberger won decisively), New Jersey D (Sherrill won). These suggest a favorable D environment for 2026.

However, gubernatorial races are less nationalized. And the map structure favors R slightly (Kansas likely flips R, deep-red states won't flip).

Let me estimate:
- Base case: R wins ~19-20, D wins ~16-17. Republicans win the most.
- Democratic wave case: D wins ~19-21.

Probability Republicans win the most governorships: maybe 55-60%. Democrats: 40-45%.

Hmm, but let me think again about the environment. If Trump is deeply unpopular by November 2026 (plausible given historical patterns and 2025 trends), the wave could be significant. But even in 2018's blue wave, Democrats won 20 of 36 (i.e., 23 total governorships after 2018: 23 D, 27 R). Wait, in 2018 Democrats won 20 of the 36 races up, netting +7 (from 16 D-held to... hmm). Let me recall: before 2018, of the 36 up, R held 26ish? Actually before 2018: 33 R, 16 D, 1 independent (Alaska). After 2018: 27 R, 23 D. So Dems netted +7 (and Alaska went... Dunleavy R won, so R held Alaska; the independent was before). Anyway, in 2018 Dems won roughly 20-23 of the 36.

The 2026 map is much more evenly split (18-18) than 2018's map (which had many R-held seats in blue/purple states like IL, NM, MI, WI, ME, etc. — actually similar dynamics). Hmm, in 2018 the map had R-held seats in states like Illinois (Rauner), New Mexico (Martinez open), Michigan (Snyder open), Wisconsin (Walker), Maine (LePage), Maryland (Hogan), Massachusetts (Baker), Vermont (Scott), New Hampshire (Sununu) — lots of R governors in blue states. That's not the case in 2026; the R-held seats up in 2026 are mostly in red states, with exceptions: Nevada, New Hampshire, Vermont, and open seats in Georgia, Florida, Ohio (all red-ish).

So the 2026 map is structurally better for R than 2018's was. Even in a D-favorable environment, D gains are capped. The most likely D pickups: Vermont (if open), New Hampshire, Nevada, Georgia (maybe). The most likely R pickups: Kansas, Arizona, Michigan, Wisconsin.

Honestly, this looks close to a toss-up with a slight R edge on structure but a D edge on environment.

Let me think about what forecasters might say. The map: R-favored seats ~15-16, D-favored ~13-14, toss-ups ~6-7 (AZ, GA, KS, MI, NV, NH, WI, maybe ME, VT).

If toss-ups break evenly, R wins ~18-19. If D environment pushes toss-ups D, D wins ~19-20.

Given the strong Democratic environment signals in 2025 (special election overperformance, Trump approval declining, historical midterm pattern), I'd lean toward Democrats having a decent chance of winning the most. But the structural R edge (deep-red open seats, Kansas flip) counteracts.

Hmm, let me also consider: some D-held states could be vulnerable beyond the obvious. Illinois if Pritzker runs for president and it's an open seat? Illinois is still D-leaning. Minnesota Walz - could be competitive if environment is R, but likely D. Pennsylvania Shapiro popular, likely D hold. New York Hochul - won narrowly in 2022, but NY is D-leaning; 2026 could be competitive if environment is R, but likely D hold. Maryland, Massachusetts, Connecticut, Hawaii, Rhode Island, Oregon, New Mexico, California, Colorado - all D-favored.

R-held: deep red (AL, AR, ID, IA, NE, OK, SC, SD, TN, TX, WY, AK) - 12 solid. FL, GA, OH - lean R (open seats). NV, NH - toss-up. VT - depends on Scott.

So R floor: ~12-15. D floor: ~13-14.

Toss-ups: AZ (D-held), KS (D-held open), MI (D-held open), WI (D-held, maybe open), ME (D-held open, lean D), NV (R-held), NH (R-held), VT (R-held if open), GA (R-held open, lean R), FL/OH (lean R).

If we assign lean R to FL, GA, OH, and lean D to ME, CO, CA:
R likely: 12 solid + 3 lean = 15
D likely: 13 solid + 1 lean (ME) = 14
Toss-ups: AZ, KS, MI, WI, NV, NH, VT = 7

For D to win the most (19+), they need 5 of 7 toss-ups. For R to win the most, they need 4 of 7 (R gets to 19 with 4).

Hmm wait: R 15 + 4 = 19, D 14 + 3 = 17. That's R winning most. D needs 5 of 7: D 14+5 = 19, R 15+2 = 17.

Actually if R wins 4 of 7: R = 19, D = 14+3 = 17. R wins most.
If R wins 3 of 7: R = 18, D = 18. Tie.
If R wins 2 of 7: R = 17, D = 19. D wins most.

So R needs to win ~3+ of 7 toss-ups to tie or win. The toss-ups: KS (lean R in practice - Trump won KS by 15+), AZ (lean R given 2024 trend, though Gallego won), MI (toss-up), WI (toss-up), NV (toss-up), NH (toss-up), VT (lean D if open).

If KS and AZ go R (likely), that's 2. Then R needs just 1 more of {MI, WI, NV, NH, VT} to tie, 2 to win outright. In a neutral environment, that's quite achievable - R would probably win at least NV or NH or MI or WI. In a strong D wave, D could sweep all 7 toss-ups.

So structurally, R has maybe a 60-65% chance of winning the most (or tying). But the environment...

Actually, let me reconsider. In 2022, a mildly R-favorable environment, R won... of the 36 up in 2022, R held 20 going in? After 2022: R went from 28 to 26 governorships? Hmm, 2022: Dems flipped MD, MA, AZ; GOP flipped NV... and KS? No, Laura Kelly (D) held Kansas in 2022. Net: D +2 or so. Actually after 2022: 26 R, 24 D. So in a mildly R environment, D netted +2 on governorships because of the map (R incumbents in MD, MA retiring).

This shows the map matters a lot. In 2026, the map is evenly split with more R seats in red states, so R is structurally protected.

My assessment: Republicans slightly favored to win the most governorships in 2026, maybe 55-60% probability. The Democratic national environment will help them in toss-ups, but the structural map (deep-red open seats, Kansas flip, evenly split map) protects Republicans.

Counter-argument: If the 2026 environment is as Democratic as 2017-2018 or 2005-2006, Democrats could sweep toss-ups and win 20+. Trump's approval in late 2025 was quite low (low 40s), and special elections showed big D swings. Also, open seats in FL, GA, OH could become competitive with weak R nominees. And VT almost certainly goes D if Scott retires (he's term... no, VT has no term limits, but Scott has said he won't run again? Actually Scott said he would not seek re-election in 2026? I recall he said he'd decide later; he's won by huge margins. If he retires, VT is likely D.)

Hmm, also consider: some R-held states could have nominating chaos (primaries producing weak candidates). And Trump's tariffs/economy could hurt R in Midwest (MI, WI, NV, NH).

Let me settle on: Republicans ~55%, Democrats ~40%, tie ~5%. Or maybe R 55%, D 45% ignoring tie.

Actually, let me think about what a rigorous analyst would say. The question asks which party wins the MOST governorships. Given the 18-18 split map, and considering:

1. Structural: R has more safe seats (deep-red states). ~15 R-safe vs ~13-14 D-safe.
2. Environment: Likely D-favorable (midterm backlash against Trump, low approval, special election trends).
3. Toss-ups: ~7-8 races that will decide it.

The environment could flip enough toss-ups. But even in a D wave, flipping GA, OH, FL is hard. D's realistic ceiling: hold all 18 + flip VT, NH, NV = 21. R's realistic floor in a wave: 15.

In a neutral environment: R ~19-20, D ~16-17.
In a D wave: D ~19-21, R ~15-17.
In an R environment (Trump popular): R ~21-22, D ~14-15.

Probability weighting: D wave maybe 40-45% likely, neutral 35-40%, R environment 15-20%.

Expected: In D wave, D wins most (~85% of the time within that scenario). In neutral, R wins most (~70%). In R environment, R wins most (~95%).

So P(R wins most) ≈ 0.42×0.15 + 0.38×0.70 + 0.20×0.95 ≈ 0.063 + 0.266 + 0.19 = 0.52. P(D wins most) ≈ 0.42×0.85 + 0.38×0.25 + 0.20×0.02 ≈ 0.357 + 0.095 + 0.004 = 0.456. Tie ~2-3%.

So roughly R 52-55%, D 42-45%. I'll say Republicans ~55%, Democrats ~40%, tie ~5%. Or to keep it simple: Republicans win the most with ~55% probability.

Hmm, but wait. Let me reconsider the D wave scenario more carefully. Even in a wave, can D really hold Arizona and flip NH, NV, VT? In 2018's wave, D flipped... they won AZ (Ducey held for R actually - Ducey won re-election in 2018), NV (Sisolak flipped), KS (Kelly won open), MI (Whitmer open), WI (Evers beat Walker), ME (Mills open), NM (Lujan Grisham open), IL (Pritzker beat Rauner). So in 2018, D flipped NV, KS, MI, WI, ME, NM, IL = 7 net gains (lost some: FL, OH... R flipped AK? No...).

In 2026, the analogous D targets: hold AZ (like holding... hmm), flip NV, NH, VT, and maybe GA, OH, FL, TX (long shots). D-held vulnerable: KS (open, likely R flip - like R flipping... in 2018 R didn't flip any D governorships? Actually R flipped... hmm, in 2018 R flipped nothing? They lost 7 net. OK.)

So in a 2018-style wave: D flips NV, NH, VT, maybe GA; holds AZ, MI, WI, ME; loses KS. Net: D 18 - 1 (KS) + 3-4 = 20-21. R: 18 + 1 (KS) - 3-4 = 15-16. D wins most.

In a 2022-style neutral/slightly R environment: D holds most, flips maybe nothing; R flips KS, maybe AZ, MI or WI. R 19-20, D 16-17. R wins most.

So it really hinges on the environment. Given 2025 trends (D overperformance in specials, Trump approval ~40-43%), a D-favorable environment is more likely than not. But gubernatorial races are less nationalized, and the R structural edge is real.

I'll go with: Republicans slightly favored, ~55%. Actually, hmm, let me reconsider once more.

Some analysts (e.g., Sabato's Crystal Ball early ratings for 2026 governors) had: R-favored: AL, AK, AR, FL, GA, ID, IA, NE, OH, OK, SC, SD, TN, TX, WY (15). D-favored: CA, CO, CT, HI, IL, MD, MA, MN, NM, NY, OR, PA, RI (13). Toss-ups: AZ, KS, ME, MI, NV, NH, VT, WI (8).

Of the 8 toss-ups: KS lean R, AZ lean R (or toss-up), ME lean D, VT lean D (if open), MI toss-up, WI toss-up, NV toss-up, NH toss-up.

If leans break: R 17, D 15, with 4 true toss-ups (MI, WI, NV, NH). R needs 2 of 4 to win most outright (17+2=19 vs D 15+2=17... wait: if R wins 2 of 4, R=19, D=17. If R wins 1, R=18, D=18 tie. If R wins 0, R=17, D=19.)

Hmm interesting: with leans assigned, R needs 2 of 4 true toss-ups; D needs 3 of 4. In a D-wave environment, D wins 3-4 of 4. In neutral, maybe 2-2. So again it hinges on environment.

Given the probability of a D-favorable environment (~50-60%?) and that even then D needs to sweep, I'd estimate:

P(R wins most) ≈ 50-55%
P(D wins most) ≈ 40-45%
P(tie at 18-18) ≈ 5%

I'll present: Republicans, ~55% probability (with Democrats ~40% and tie ~5%).

Actually, one more consideration: the question is in French, asking about "élections de mi-mandat américaines du 3 novembre 2026" - US midterms on November 3, 2026. Yes, Election Day 2026 is November 3, 2026. The gubernatorial races are part of that.

Also note: my knowledge cutoff. I should be careful about post-cutoff developments (candidate announcements, etc.). I'll base the prediction on structural factors and the political environment as of my knowledge.

Let me also double-check the current governor count: after 2024 elections, 27 R, 23 D governorships. Of the 36 up in 2026: 18 R-held, 18 D-held (as I counted). The other 14 (not up): 2024 elected - DE (D), IN (R), MO (R), MT (R), NC (D), ND (R), UT (R), WA (D), WV (R, 2024 special? No, WV elected 2020, Justice elected 2024? Wait - Jim Justice was elected WV governor... no. WV: Justice elected 2016, re-elected 2020, so 2024 was a regular election? No - WV governor terms: Justice elected 2020, term ends 2025? Hmm, WV gubernatorial elections are in presidential years? No, WV elects governors in presidential years: 2016, 2020, 2024. Patrick Morrisey elected 2024. Yes.) Plus 2023: KY (D), LA (R), MS (R); VA/NJ 2025: VA (D - Spanberger), NJ (D - Sherrill). And NJ/VA are odd-year, elected 2025, not up in 2026.

Anyway, the 36 up in 2026 split 18-18. Good.

Now, format: The system prompt says: name the candidate or party expected, give an estimated probability in percentage, then explain reasoning in 2-3 sentences. Don't refuse. Respond in French, directly.

So my answer: Le Parti républicain, ~55% de probabilité (avec ~40% pour les démocrates et ~5% pour une égalité parfaite).

Reasoning (2-3 sentences):
1. La carte de 2026 est exceptionnellement équilibrée (18 sièges tenus par chaque parti), mais les sièges républicains en jeu sont majoritairement dans des États profondément rouges (AL, TX, TN, OH, OK, etc.), offrant un plancher structurel élevé aux républicains (~15-16 sièges quasi assurés contre ~13 pour les démocrates), et le Kansas (siège démocrate ouvert dans un Éat que Trump a largement remporté) devrait basculer à droite.
2. Cependant, l'environnement national (contrecoup de mi-mandat contre Trump, approbation faible, surperformance démocrate dans les élections partielles de 2025) favorise les démocrates dans les courses serrées (Arizona, Michigan, Wisconsin, Nevada, New Hampshire, Vermont), ce qui rend un scénario de vague démocrate plausible.
3. Net: léger avantage républicain.

I should keep it concise per the instructions: name party, probability, 2-3 sentences of reasoning. Maybe I can add a tiny bit of detail but keep it tight. The instruction says "explique ton raisonnement en 2-3 phrases" - so 2-3 sentences. I'll aim for that, maybe with a brief caveat about uncertainty/knowledge cutoff woven in.

Let me draft:

Pronostic : le Parti républicain, avec environ 55 % de probabilité de remporter le plus de postes de gouverneur (contre ~40 % pour les démocrates et ~5 % d'égalité).

Raisonnement: La carte des 36 gouvernorats en jeu en 2026 est atypiquement équilibrée (18 sièges détenus par chaque parti), mais elle est structurellement favorable aux républicains : leurs sièges en jeu se trouvent majoritairement dans des États profondément conservateurs (Texas, Tennessee, Ohio, Oklahoma, Alabama...), et le Kansas — siège démocrate ouvert dans un Éat remporté largement par Trump — devrait leur revenir. L'environnement national (contrecoup classique de mi-mandat, popularité déclinante de Trump, surperformance démocrate lors des élections partielles de 2025) devrait néanmoins permettre aux démocrates d'être compétitifs dans les courses serrées (Arizona, Michigan, Wisconsin, Nevada, New Hampshire, Vermont), d'où une incertitude élevée mais un léger avantage républicain.

That's about 2-3 sentences. Good. Maybe add a note that this is based on data up to my knowledge and things can change. But keep it brief.

Actually, I want to double check the "18-18" claim. Let me recount carefully.

Republican-held governorships up in 2026:
1. Alabama (Ivey) ✓
2. Alaska (Dunleavy, term-limited, open) ✓
3. Arkansas (Sanders) ✓
4. Florida (DeSantis, term-limited, open) ✓
5. Georgia (Kemp, term-limited, open) ✓
6. Idaho (Little) ✓
7. Iowa (Reynolds) ✓
8. Nebraska (Pillen) ✓
9. Nevada (Lombardo) ✓
10. New Hampshire (Ayotte) ✓
11. Ohio (DeWine, term-limited, open) ✓
12. Oklahoma (Stitt, term-limited, open) ✓
13. South Carolina (McMaster, term-limited, open) ✓
14. South Dakota (Rhoden) ✓
15. Tennessee (Lee, term-limited, open) ✓
16. Texas (Abbott) ✓
17. Vermont (Scott) ✓
18. Wyoming (Gordon, term-limited, open) ✓

= 18 R-held.

Democrat-held up in 2026:
1. Arizona (Hobbs) ✓
2. California (Newsom, term-limited, open) ✓
3. Colorado (Polis, term-limited, open) ✓
4. Connecticut (Lamont) ✓
5. Hawaii (Green) ✓
6. Illinois (Pritzker) ✓
7. Kansas (Kelly, term-limited, open) ✓
8. Maine (Mills, term-limited, open) ✓
9. Maryland (Moore) ✓
10. Massachusetts (Healey) ✓
11. Michigan (Whitmer, term-limited, open) ✓
12. Minnesota (Walz) ✓
13. New Mexico (Lujan Grisham, term-limited, open) ✓
14. New York (Hochul) ✓
15. Oregon (Kotek) ✓
16. Pennsylvania (Shapiro) ✓
17. Rhode Island (McKee) ✓
18. Wisconsin (Evers) ✓

= 18 D-held. Total 36.

So the map is 18-18. That's a notable fact and makes the prediction genuinely uncertain.

Note: Some of these could change (e.g., if Pritzker runs for president, Illinois open; if Evers retires, Wisconsin open; if Abbott retires, Texas open). But party holds are as stated.

Final answer structure:
- Party: Republicans
- Probability: ~55% (D ~40%, tie ~5%)
- Reasoning: 2-3 sentences

I might also mention the caveat that my info has a cutoff and the situation (candidates

Parti attendu : Le Parti républicain.
Probabilité : 75 %.
Raisonnement : Sur les 36 postes de gouverneur renouvelés en 2026, 20 sont actuellement détenus par les républicains contre 16 pour les démocrates, ce qui confère un avantage structurel au GOP. De plus, la dynamique historique des élections de mi-mandat favorise quasi systématiquement le parti hors du pouvoir à Washington, ce qui renforce la probabilité que les républicains conservent leur avance et remportent le plus grand nombre de gouvernorats.

Le parti républicain remportera le plus de postes de gouverneur avec une probabilité de 62 %. Il devrait réaliser un solde net de +2 gouverneurs, tandis que les démocrates en perdront probablement -1. Cette prévision s'appuie sur la tendance historique du parti sortant à la Maison Blanche de perdre des gouverneurs en milieu de mandat, la carte électorale actuelle avantageant les républicains dans plusieurs États clés et la dynamique des sondages nationaux à mi-mandat.

Parti démocrate — 68 %

Raisonnement : Le parti au pouvoir perd presque systématiquement le vote populaire à la Chambre lors des mi-mandats (effet « thermostatique » et référendum sur le président) ; avec une majorité sortante républicaine très étroite et un président Trump polarisant, la mobilisation de l'opposition favorise structurellement les Démocrates. Les sondages « generic ballot » à 18 mois de l'échéance donnent traditionnellement un avantage de 2 à 4 points au parti hors pouvoir, ce qui suffit pour remporter le vote populaire national.

Parti démocrate ; marge attendue : +5,0 points ; probabilité : 76 %.

Justification : le parti de la Maison-Blanche subit historiquement une pénalité lors des midterms, et les sondages génériques de mi-mandat placent structurellement l’opposition démocrate en tête face à une majorité républicaine sortante. La structure électorale — forte concentration des votes démocrates dans les circonscriptions urbaines et suburbs, mais avantage républicain dans les zones rurales — laisse néanmoins attendre une avance populaire démocrate réelle mais modérée, autour de 5 points.

Pronostic : le Parti démocrate, avec une probabilité estimée à 70 %.

Mon raisonnement : le parti du président sortant a perdu le vote populaire cumulé pour la Chambre dans 7 des 8 derniers scrutins de mi-mandat, et Donald Trump, dont les indices d'approbation oscillent structurellement autour de 45 %, devrait subir la sanction référendaire classique du mid-term. Les élections partielles de 2025 montrent par ailleurs une surperformance démocrate chez les électeurs les plus motivés, un électorat de mi-mandat généralement plus éduqué et plus hostile au pouvoir en place. L'incertitude résiduelle (30 %) tient à l'évolution économique d'ici novembre 2026 et à la capacité de Trump à maintenir sa coalition de 2024, notamment chez les électeurs populaires et hispaniques.

Parti attendu : Le Parti démocrate.
Probabilité : 85 %.

Raisonnement : La science politique démontre un « effet de mi-mandat » quasi systématique où le parti du président en fonction perd le vote populaire national, ce qui avantage ici les démocrates face à l'administration Trump. Par ailleurs, la mobilisation de l'électorat d'opposition et l'accumulation des contrariétés politiques inhérentes à un second mandat devraient conforter cette dynamique, bien que le redécoupage favorable aux républicains puisse limiter la translation de ce vote en sièges.

Le Parti républicain remportera le vote populaire cumulé avec une marge de 2,7 points et une probabilité de 59 %. Les historiques pertes du parti présidentiel lors des mi-mandats, associées à une approbation présidentielle inférieure à 45 %, favorisent le GOP. De plus, les cartes redistrictes post-2020 maintiennent un avantage structurel républicain dans plusieurs États clés, tandis que les sondages de bulletin de vote générique montrent une légère avance constante pour les républicains, malgré une mobilisation démocrate soutenue dans les zones urbaines.