About This Market
Traders give Bill Keating (D) about a 97.1% chance. Tyler MacAllister (R) follows at 2.1%. Compare prices from Kalshi, Polymarket US, and Polymarket. The largest cross-platform price difference is 1.3 percentage points.
Traders give Bill Keating (D) about a 97.1% chance. Tyler MacAllister (R) follows at 2.1%. Compare prices from Kalshi, Polymarket US, and Polymarket. The largest cross-platform price difference is 1.3 percentage points.
Polymarket and Kalshi are tracking the winner of the MA-09 House election, scheduled for November 3, 2026. The market resolves based on the official results announced by the Massachusetts Secretary of State after the election concludes, with odds fluctuating based on candidate campaigns and voter sentiment leading up to the date.



