Final polls, models and markets see a "blue tsunami"
Summary
On the eve of the U.S. midterm elections, polls, forecasting models and prediction markets all point to strong Democratic gains, including a possible Senate win. Analysts caution that polling bias and shared data sources could make these forecasts wrong, and the results will depend on voters.Key Facts
- Nate Silver’s model gives Democrats a 95% chance of winning the House and an 80% chance of winning the Senate, with an average projected gain of 25 House seats.
- Final New York Times/Siena polls show Democrats leading in all seven surveyed Senate battleground states, though five leads fall within the margin of error.
- The Cook Political Report says Democrats could win as many as 240 House seats if they sweep all 18 toss-up races.
- Kalshi assigns Democrats a 73% chance of winning both chambers of Congress; nearly $100 million in contracts have traded on its congressional control market.
- AtlasIntel’s final poll gives Democrats a 14-point lead on the generic congressional ballot.
- Polling analysts warn that Democrats may be more likely than Republicans to respond to surveys, which could overstate Democratic support.
- President Donald Trump and House Speaker Mike Johnson accused pollsters of creating the appearance of a Democratic wave to affect Republican turnout.
- Prediction markets can share the blind spots of polls because their odds often reflect the same polling data and political sentiment.
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