US Midterms 2026 (3 November 2026): Democratic Party wins majority in the US House of Representatives with at least 218 of 435 seats (confirmed by AP or NBC News by 7 November 2026)
Pending
✦ AI-generated prediction
Published on 17. September 2026
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Predicted for 3. November 2026
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Based on: Speculative
Polymarket (as of 17 September 2026) prices a full Democratic Sweep (both chambers) at 60% and the 'Republican Senate / Democratic House' scenario at 31%, implying a total probability of ~91% for a Democratic House win. Nate Silver's Silver Bulletin model shows Democrats with a generic ballot advantage of D+7 to D+12 and Trump approval at ~38%; historically the president's party loses the House at such readings (2006: D+31 seats, 2018: D+41 seats). This prediction focuses exclusively on the House and is consistent with the open Cassandra forecast 'Democrats win Senate majority ≥51 seats'. Calibrated value 76% — conservatively below Polymarket's implied ~91% to account for polling errors and potential late swings.
Data basis for this prediction
- Polymarket US Midterms 2026: Dem Sweep 60 %, R Senate/D House 31 %, R Sweep 11 % (17.09.2026)
- Nate Silver / Silver Bulletin: Demokraten favorisiert für beide Kammern, Generic Ballot D+7–12 (17.09.2026)
- Trump-Zustimmungsrate ~38 % (Newsweek, 17.09.2026)
- Historische Midterm-Muster: Approval < 40 % → Repräsentantenhaus-Verlust der Regierungspartei (FiveThirtyEight-Archiv)
Verdict: Pending
This prediction is still open. It will be evaluated automatically against real-world sources after its due date.
🏛️ Politics
✦ AI
Polymarket gives 54% to Bolsonaro and 45% to Lula in the overall winner market (as of 17 Sept 2026). Runoff polls paint a near-perfect tie: Datafolha 46:44 for Lula, AtlasIntel 46.4:46.2 for Lula, PoderData 47:45 for Bolsonaro, Quaest 41:41. Polymarket capital weighting implies a slight right-wing mobilisation premium potentially underrepresented in traditional polling. Consistent with open Cassandra predictions: no first-round winner (>50%), Lula >37% and Bolsonaro >30% in Round 1, placing the runoff on 25 October.
🏛️ Politics
✦ AI
The latest PolitPro polling (September 17, 2026) shows Berlin SPD at only 12.1% — a dramatic collapse from 18.4% in the 2023 repeat election. The party ranks 6th behind Die Linke (20.6%), CDU (19.9%), AfD (17.8%), and Grüne (16.0%). SPD suffers from national coalition disputes, loss of working-class voters to AfD and Die Linke, and a weak Berlin lead candidate. Surging above 14% in the remaining 72 hours before the election would require a swing of ~+2 percentage points — statistically very unlikely with opinions largely crystallized. The 14% threshold is 1.9 points above the polling average. No prediction market covers this specific SPD threshold for Berlin.
🏛️ Politics
✦ AI
PolitPro Election Trend (as of September 15, 2026) puts KPRF at 15.8% — well above its historical baseline of 8–10%. In Russia's wartime environment, the Communist Party channels both regime-loyal protest voters and latent anti-war sentiment with no other legal outlet. Historically, KPRF got 18.9% in 2021 (strong protest vote) but only 13.3% in 2016. Official counts in Russia frequently deviate downward from polls due to vote manipulation favouring United Russia, creating genuine risk the formal result stays below 15.0%. No Polymarket or Kalshi market found for this event.