Democratic control leads Polymarket midterm pricing ahead of November 3
PolymarketTrader's midterm forecast, updated November 1 ahead of the November 3 election, prices Democrats at 94.5 percent to win the House and 72.5 percent to win the Senate. The most likely balance of power is a Democratic sweep at 71.5 percent, with 2 Senate races, 14 House districts and no governor races rated as toss-ups.
PolymarketTrader’s midterm forecast puts Democrats at 94.5 percent to win the House and 72.5 percent to win the Senate, according to its November 1 update ahead of the November 3 election.
The forecast was published Nov 1, 2026, at 2:00 PM ET. Its pricing favors Democrats in both chambers, though the Senate outcome carries more uncertainty than the House.
A sweep is the leading outcome
A Democratic sweep is the most likely balance-of-power outcome at 71.5 percent, according to PolymarketTrader. That is 1 percentage point below the probability assigned to a Democratic Senate victory.
The forecast rates 2 Senate races and 14 House districts as toss-ups. No governor races receive that rating.
What it means for prediction markets
- House and Senate pricing differ substantially: The 94.5 percent House probability signals a stronger Democratic advantage than the Senate’s 72.5 percent.
- The sweep price sits close to the Senate price: At 71.5 percent, Democratic control of both chambers is priced only slightly below a Democratic Senate win.
- Race ratings and control probabilities are distinct: The toss-up counts describe individual contests; they should not be read as guarantees about chamber-level outcomes.
Sources & attribution
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