Democratic congressional forecasts favor House gains but trail Senate market expectations

As of Nov 3, 2026 · 3:30 PM ET, final forecasting models put Democrats’ chances of Senate control below market expectations, according to NorthJersey.com. Decision Desk HQ places that probability at 65 percent, alongside a 63 percent chance of Democrats winning both chambers.

Models point toward Democratic majorities

Decision Desk HQ projects Democrats will secure 241 House seats and 52 Senate seats, according to NorthJersey.com. Those seat forecasts point to majorities in both chambers, although the probability estimates leave room for a different outcome.

The Economist’s model gives Democrats about a 93 percent chance of taking the House, NorthJersey.com reports. Its median forecast puts the Democratic advantage at 31 seats.

The available summary does not provide specific market probabilities for Senate control, so the size of the model-market gap cannot be quantified. It also does not include a Senate probability from The Economist for comparison with Decision Desk HQ.

What it means for prediction markets

• House and Senate forecasts convey different levels of confidence. The Economist’s roughly 93 percent House estimate is substantially higher than Decision Desk HQ’s 65 percent Senate estimate, though they come from different models.
• A two-chamber outcome is a separate proposition. Decision Desk HQ’s 63 percent Democratic sweep probability is below its estimate for Democratic Senate control.
• The market comparison has limits. NorthJersey.com describes Senate forecasts as below market expectations, but the supplied material contains no market prices with which to measure that difference.