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UBS and Polymarket diverge sharply on Democratic control of Congress

Market Flux reports Polymarket put the probability of a full Democratic sweep at 75 percent, a figure that rose to new highs throughout Election Day, with Democrats at 95 percent for the House and 77 percent for the Senate. UBS assigned only 50 percent odds to a sweep and warned such an outcome could complicate the fiscal agenda and 2027 debt-ceiling negotiations.

A 25-point gap on a sweep

Polymarket priced a Democratic sweep of Congress at 75 percent on Election Day, compared with UBS’s assessment of 50 percent, according to Market Flux. The two estimates leave a 25-percentage-point gap over the prospect of Democrats winning both chambers.

Market Flux’s update, published Nov 3, 2026, at 1:45 PM ET, said the Polymarket probability of a sweep had reached successive highs throughout Election Day.

Senate odds lag the House

The chamber-level probabilities showed a stronger expectation of Democratic control in the House. According to Market Flux, Polymarket put Democrats at 95 percent for the House and 77 percent for the Senate.

UBS’s more cautious sweep estimate came with a policy warning: Democratic control of both chambers could complicate the fiscal agenda and 2027 debt-ceiling negotiations, according to Market Flux.

What it means for prediction markets

  • A substantial disagreement: Polymarket’s 75 percent sweep probability was well above UBS’s 50 percent assessment. The supplied reporting does not explain the basis for that difference.
  • Uneven chamber expectations: The 95 percent House probability and 77 percent Senate probability indicate that the Senate was the less certain component of a Democratic sweep.
  • Policy implications remain conditional: UBS flagged potential complications for the fiscal agenda and 2027 debt-ceiling negotiations, not a certain outcome from Democratic control.
PolymarketSenateCongressElectionsInfiniti MarketsInfiniti Signals

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