Senate venue gap narrows to 1.3 points

Senate pricing converges

Democrats’ blended probability of taking Senate control stood at 63%, according to defirate.com’s summary published Oct 14, 2026, at 5:09 PM ET.

Kalshi priced Democratic Senate control at 62.7c, compared with 64c on Polymarket. The gap between the two venues narrowed to 1.3 percentage points, with Polymarket assigning the higher probability.

Both venues therefore favored Democratic control, despite the remaining pricing difference. The available summary does not provide an earlier spread or indicate which venue’s movement drove the narrowing.

House odds remain higher

The summary put Democrats’ probability of House control at 90%, above the 63% blended Senate figure. It did not include separate House prices for Kalshi and Polymarket.

What it means for prediction markets

• Venue differences are small but visible: The Senate contracts show a 1.3-point spread between Kalshi and Polymarket, rather than identical pricing.
• Chamber expectations differ: The reported probabilities favor Democratic control of both chambers, but indicate substantially greater uncertainty around the Senate.
• Trend detail is limited: Without earlier prices, the narrowing spread alone does not establish whether overall expectations for Democratic Senate control rose or fell.