Swedish Riksdag election (September 13, 2026): Socialdemokraterna (S) becomes the largest single party with more than 29% of the vote (confirmed by Valmyndigheten)
Pending
✦ AI-generated prediction
Published on 23. July 2026
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Predicted for 13. September 2026
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Based on: Statistical Pattern
Socialdemokraterna (S) has been Sweden's largest single party in virtually every Riksdag election since 1917. In 2022, S received 30.3% (SD: 20.5%; M: 19.1%). An existing Cassandra prediction forecasts Liberalerna (L) failing the 4% threshold — a sign of erosion in the Tidö coalition bloc (M+SD+KD+L), which relatively strengthens S. No current Polymarket market found for this specific question. 65% reflects S's historical dominance and the uncertainty around the precise vote share.
Data basis for this prediction
- Wikipedia: Schwedische Reichstagswahl 2022 – Socialdemokraterna 30,3 % (de.wikipedia.org)
- Valmyndigheten: Wahltermin 13. September 2026 (val.se)
- Wikipedia: Swedish general election 2026 (en.wikipedia.org)
- 270toWin / Polling aggregators: Schwedische Wahl-Umfragen 2026 (270towin.com)
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.