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Polymarket Midterm House Seat Markets Put Two GOP Outcomes at 28%
The two ranges are outcomes in one Polymarket event. The below-170 probability rose 27% over 24 hours, while the 170-to-174 outcome rose 25%.

The probability of Republicans winning fewer than 170 seats in the U.S. House after the 2026 midterm elections stood at 28%. Another outcome in the same Polymarket event, a 170-to-174 seat total, also stood at 28%.
The below-170 probability was up 27% over 24 hours, while the 170-to-174 probability was up 25%.
The figures are market probabilities for possible seat totals, not election results or a count of seats won.