Prediction markets are betting big on a Democratic sweep of the 2026 U.S. midterm elections. Data from Polymarket and Kalshi, two leading platforms, shows combined trading volume has topped $12.5 million. The most likely outcome, according to the odds, is a Democratic takeover of both chambers of Congress.
What the Markets Are Saying
On Polymarket, contracts tied to the 2026 midterms give Democrats a clear edge. Kalshi's equivalent markets point in the same direction. Neither platform offers a razor-thin margin — the probability of a Democratic sweep sits well above 50% on both. Traders are putting real money behind that forecast, and the volume suggests conviction, not a fluke.
The Trump Factor
Donald Trump's approval rating stands at 34%, according to polling cited in market commentary. That number is a key input for traders. A president with approval in the low 30s often drags down his party's candidates in midterm elections. The markets appear to be pricing that in. The 2026 vote is still more than two years away, but the signal from the trading floors is hard to ignore.
A Surge in Trading Activity
Combined volume across Polymarket and Kalshi for 2026 midterm contracts has exceeded $12.5 million. That's not trivial for a market that covers an election cycle still far off. The activity suggests a growing appetite for event-based trading. Polymarket and Kalshi have drawn both retail bettors and more serious investors looking for a measure of political sentiment. The liquidity in these markets is rising, even if the election itself is not until November 2026.
Neither platform has released a breakdown of who is placing the bets. The data remains aggregated. But the sheer size of the positions implies that a Democratic sweep is not just a possibility — it's the baseline assumption.
What happens between now and 2026 is anyone's guess. The economy, foreign policy, and candidate quality will all matter. For now, the prediction markets have cast their vote.
