Berlin state election (September 20, 2026): CDU becomes the largest party in the Berlin House of Representatives
Pending
✦ AI-generated prediction
Published on 3. September 2026
·
Predicted for 20. September 2026
·
Based on: Historical Cycle
CDU under lead candidate Stefan Evers polls at 19–20% (INSA: 20%, Civey: 19%), narrowly ahead of Die Linke (19–21%) and AfD (17–18%). The race is extremely tight—all three parties within 3 percentage points. CDU benefits from strong turnout mobilization and Evers' visibility as former parliamentary leader. In a three-way horse race, CDU becoming largest party represents a ~40–45% scenario. Coalition formation (CDU+Greens+SPD or Linke+Greens+SPD) depends more on the bloc balance than CDU margin. No Polymarket market available.
Data basis for this prediction
- INSA Berlin Umfrage: CDU 20 %, Linke 19 %, AfD 17 % (T-Online, 13. August 2026)
- Civey Berlin Umfrage: Linke 21 %, CDU 19 %, AfD 18 % (T-Online, 5. August 2026)
- Koalitionsrechner Berlin 2026: realistische Optionen CDU/Grüne/SPD oder Linke/Grüne/SPD (koalitions-rechner.de)
- dawum.de Berlin-Wahltrend (Stand 3. September 2026)
Verdict: Pending
This prediction is still open. It will be evaluated automatically against real-world sources after its due date.
🏛️ Politics
✦ AI
The SPD received exactly 18.4% in the 2023 Berlin state election and has since been in opposition. Current polls (August/September 2026) put the SPD at 19–22%, making a result above 18.0% likely. Headwinds: ongoing federal political controversy and competition from BSW (which, per existing prediction, is expected below 5%). The 18.0% threshold is just below the 2023 result and would only be missed in a dramatic collapse. No Polymarket market; Metaculus aggregate implies ~65% for SPD above 18%.
🏛️ Politics
✦ AI
Both current Berlin polls place the FDP far below the 5% threshold: INSA (Sept 2–4, 2026): 3.0%; Infratest dimap (Aug 27–31, 2026): FDP below the statistical detectable threshold. The Berlin FDP has not reached the 5% mark in any poll since spring 2026. Clearing the hurdle would require a simultaneous systematic error of 2+ points from both institutes — historically near-unprecedented. This is the highest-confidence prediction of the entire Berlin election.
🏛️ Politics
✦ AI
Current polls show Liberalerna well below the 4% threshold: Indikator Opinion (fieldwork to September 4, 2026): 2.2%; PolitPro election trend (as of September 9, 2026): 2.7%. Neither institute identifies meaningful upward momentum. The party was part of the Tidö coalition but suffered from its image problems. Even with maximum systematic polling error of +1.5 points, Liberalerna would remain below 4.2%. Failing to enter the Riksdag would cost the governing coalition its parliamentary majority.