House Flip? Senate Hold? Prediction Markets Unleash Wild 2026 Midterm Election Bets

Prediction markets Polymarket and Kalshi show traders betting on a Democratic takeover of the U.S. House in the 2026 midterms, with Republicans favored to hold the Senate. Tens of millions of dollars are wagered across hundreds of races. On Polymarket, Democrats have an 86% probability of winning the House.