Polymarket and Kalshi put Democrats’ chances of winning both the House and Senate in the November 3, 2026, midterm elections at 78% and 74%, respectively. These are betting-market odds, not election results. The source says polling also points toward a possible Democratic sweep, but notes that prediction markets have had mixed accuracy since 2024.
All 435 House seats and 35 of the 100 Senate seats are being contested. The Center for Democracy and Technology has warned that prediction markets can affect voter behavior and confidence in elections.
