Polymarket prices favor Democratic control as Senate odds climb faster

Democrats were favored to control both chambers in Polymarket pricing checked on the morning of November 2, according to MonitoringRoom. The House market put their chances at 94.5 percent, while the Senate market stood at 71.5 percent the day before the election.

Senate pricing shows the larger move

The Senate probability rose 7 points in a week, from 64.5 percent on October 26 to 71.5 percent. Over the same period, the House probability increased 3 points, from 91.5 percent to 94.5 percent, according to MonitoringRoom.

The separate balance of power market priced Democrats winning both chambers at 70.5 percent. That was below the 71.5 percent probability MonitoringRoom described as implied by the Senate market, making Senate control the less certain component of a Democratic sweep.

MonitoringRoom’s account, published November 2, 2026, at 4:45 AM ET, described the House, Senate and balance of power markets as internally consistent to within half a point. The supplied figures, however, show a 1-point gap between the both-chambers price and the Senate-implied probability; the summary does not explain that difference.

What it means for prediction markets

• The markets point in the same direction: All three favor Democratic control, although the House probability is substantially higher than the Senate probability.
• The larger weekly shift was in the Senate: Its 7-point increase exceeded the House market’s 3-point rise.
• The consistency claim needs qualification: The reported half-point alignment cannot be fully reconciled with the supplied 70.5 percent and 71.5 percent figures. These prices represent market probabilities, not confirmed election outcomes.