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🏛️ Politics · Next Month

US Midterm Elections November 3, 2026: Republican Party retains Senate majority (net ≥51 seats, confirmed by AP or NBC News by November 4, 2026)

Miss ✦ AI-generated prediction Published on 11. September 2026 · Predicted for 3. November 2026 · Based on: Speculative
Probability
59%

Metaculus (September 2026) gives Republicans ~59% probability of Senate majority; Polymarket and RealClearPolling confirm ~59–62%. Of 35 seats up for election, Republicans currently hold 53 vs. 47 Democrats. Democrats need a net gain of +4 seats — the Senate map favors Republicans (23 R seats vs. 12 D seats in play). Consistent with open Cassandra prediction 'Democrats win House with ≥6 net seats': a split Congress with Democratic House and Republican Senate is the most likely scenario (Metaculus: 49.2%).

Data basis for this prediction
  • Metaculus 'US Senate plurality after 2026 midterms': Republikaner ~59 % (Stand September 2026)
  • Polymarket 'Which party will win the Senate in 2026': ~60 % Republikaner (September 2026)
  • 270toWin.com / RealClearPolling Senate Map 2026: Stand September 2026
  • Metaculus Congressional Control Scenarios: Rep Senate + Dem House 49,2 % wahrscheinlichstes Szenario
Verdict: Miss
Die Vorhersage ist klar nicht eingetreten. Laut NBC News (nbcnews.com/politics/2026-elections/senate-results) gewannen die Demokraten die Senatsmehrheit mit 54 zu 44 Sitzen – sie flippten mindestens 7 republikanische Sitze (u.a. Texas, Kansas, Iowa, Ohio, North Carolina, South Carolina, Maine). Damit übertrafen die Demokraten das nötige Netto-Plus von +4 Sitzen deutlich. Die Prognosemodelle (Metaculus 59 %, Polymarket 59–62 % für Republikaner) unterschätzten die Stärke der demokratischen Welle, die sich als historisch erwiesen hat – vergleichbar mit 2008. Die Senats-Karte, die als strukturell vorteilhaft für Republikaner galt, wurde durch hohe demokratische Beteiligung und Ablehnung der Trump-GOP überwunden.
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Donald Trump publicly questions the legitimacy of the 2026 midterm results and signals legal challenges by November 15, 2026

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Alberto Núñez Feijóo (PP) secures parliamentary majority with Vox coalition and becomes Spanish Prime Minister — General Election 29 November 2026 (confirmed by Junta Electoral Central or AP by 1 December 2026)

Spain holds a general election on 29 November 2026. Polymarket prices Feijóo as next PM at 85%, Kalshi at 82% — both serve as anchors. A separate Polymarket market gives PP+Vox a 92% probability of a joint majority (>176/350 seats). Current polls (Sondaxe) show PP at 29.2% narrowly ahead of PSOE (26.9%); Vox is tracking slightly higher. Feijóo failed to form a government in 2023, but market odds reflect the lesson learned: PP+Vox is now seen as stable enough. No deviation from market anchor warranted.

83%
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