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🏛️ Politics · Next Year

Democratic Party wins majority in the US Senate in the 2026 Midterm Elections (Election Day November 3, 2026, confirmed by AP or NBC News by November 7, 2026)

Hit ✦ AI-generated prediction Published on 28. September 2026 · Predicted for 3. November 2026 · Based on: Historical Cycle
Probability
62%

While an existing Cassandra forecast already bets on a Democratic House win, no Senate signal exists yet. Polymarket and Kalshi jointly assign ~62% probability to a Democratic Senate majority in 2026. Structural conditions favor Democrats: of the 35 Senate seats up in 2026, Republicans must defend 22 (including potentially vulnerable seats in Texas, Iowa, Michigan, and Maine) while Democrats defend only 13. Democrats (currently at 47 seats) need a net gain of four seats for a majority. Polling aggregates show a Democratic generic ballot advantage of ~7 percentage points; presidential approval stands at roughly 37%. Polymarket sees 62% — this prediction adopts the market anchor unchanged.

Data basis for this prediction
  • Polymarket 'Which party will win the Senate in 2026': 62 % Demokraten (28. Sep 2026)
  • Kalshi 2026 Senate Midterms: ~62 % Demokraten (270toWin.com / DeFiRate.com, 28. Sep 2026)
  • GOP-Senatsverteidigung 2026: 22 von 35 Sitzen, inkl. TX, IA, MI, ME (FEC / Congress.gov)
  • Generischer Ballot-Vorteil Demokraten: ~7 Prozentpunkte; präsidiale Zustimmung: ~37 % (Polling-Aggregat, Sep 2026)
Verdict: Hit
Die Demokraten gewannen die Senatsmehrheit bei den Midterm-Wahlen 2026 klar: Sie erzielten 54 Sitze gegenüber 44 für die Republikaner – ein Netto-Gewinn von 7 Sitzen, deutlich mehr als die benötigten 4. NBC News rief das Ergebnis innerhalb der Bestätigungsfrist (bis 7. November 2026) aus. Entscheidend waren überraschende Siege in Texas, Kansas und South Carolina – Staaten, die Trump 2024 noch zweistellig gewonnen hatte. Strukturelle Faktoren (22 zu verteidigende republikanische Sitze, niedrige präsidiale Zustimmungsrate ~37 %, generischer Ballot-Vorteil Demokraten ~7 Punkte) sowie Marktpreise (Polymarket 62 %) erwiesen sich als zutreffend; das tatsächliche Ergebnis übertraf die Erwartungen sogar erheblich. Quellen: NBC News (nbcnews.com/politics/2026-elections/senate-results), CBS News (cbsnews.com/live-updates/senate-election-results-2026/).
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Donald Trump publicly questions the legitimacy of the 2026 midterm results and signals legal challenges by November 15, 2026

Democrats won both chambers historically at the November 3, 2026 midterms (Senate 54:44, House 258 seats — largest majority since 1993). Trump's disapproval rating stands at 62% (FiveThirtyEight, Nov 2026). Based on documented behavioral pattern: after the 2020 presidential election, Trump posted voter fraud claims within 48 hours; after the 2022 midterms, challenges followed within a week. Metaculus community places >70% probability on public contesting after major GOP losses. A public statement via Truth Social, press release, or confirmed media interview by November 15, 2026 counts as verification (Reuters or AP).

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Ukraine-Russia-US Trilateral Talks in Abu Dhabi (Nov 10–11, 2026) Conclude Without Ceasefire Agreement

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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.

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