Kalshi, Polymarket Give Democrats 63-65% Odds of Sweeping Congress in 2026 Midterms

3.0 · 4d ago · US

The Facts

  • Polls broadly show Democrats ahead in the national House popular vote and competitive in several red-state Senate races; CBS News summary says surveys show Democrats leading in both the House and Senate, with a narrow Senate lead. ✓2 · CNBC, CBS News
  • The 2026 U.S. midterm election is a week from Tuesday, with Republicans defending majorities in both the House and Senate. CNBC only
  • Kalshi traders place a 63% chance on Democrats winning both the House and Senate, a figure CNBC says has been relatively stable since early October. CNBC only
  • On Kalshi, Republicans have just under a 10% chance of winning both chambers, and a 29% chance exists of Democrats winning the House while the GOP holds the Senate. CNBC only
  • On Polymarket, Democrats have a 65% chance of winning both chambers. CNBC only
Dive deeper · 3 more factsShow less
  • Democrats' odds of a sweep were below 50% before early September and around 30% earlier in the year, before the start of the U.S.-Iran war and higher gas prices, per CNBC. CNBC only
  • House Speaker Mike Johnson said on Fox News Monday that 'the polling is inaccurate.' CNBC only
  • Prediction markets favored Flavio Bolsonaro in Brazil's presidential election before polls closed Sunday, but incumbent Lula da Silva was re-elected. CNBC only

Context

With about a week until the 2026 U.S. midterms, prediction markets and polls both point to Democrats as favorites to take control of Congress. CNBC notes that prediction market odds do not use traditional polling methodologies and are not substitutes for polls.

CNBC disclosed a commercial relationship with Kalshi that includes customer acquisition and a minority investment. Platforms say outcomes occur at roughly the frequency of their stated odds.

How the Agent Panel Scored This

Independent AI personas each scored importance 1–10; the story's score is a trimmed mean (highest and lowest votes dropped). Vote spread: 1.

3 News Editor This story reports prediction-market odds and poll readings about an upcoming election rather than a concrete new event, so its impact is limited to commentary on expectations, though the midterms themselves are significant.
3 Science & Tech Analyst The story reports prediction market odds and poll summaries plus a Johnson comment, with no new concrete event like a vote, law, or policy action, so it is minor news with limited impact.
3 Global Affairs Analyst The story reports prediction market odds and polls about an upcoming election, along with a Speaker's rhetorical dismissal of polling, with no concrete new event or policy action beyond market pricing, so it is minor news with limited direct impact.
3 Critical Reader The story reports prediction-market odds and poll readings for an upcoming election rather than a concrete new event, with the only action being Speaker Johnson's verbal dismissal of polls, so its impact is limited.
3 Business Analyst The story reports prediction market odds and polls, which are sentiment indicators rather than a concrete market-moving event, with the only action-like item being Speaker Johnson's verbal criticism of polls, so impact is limited to a niche political-forecasting audience.
3 Informed Citizen The story reports prediction market odds and polls, which are sentiment indicators rather than concrete actions, though the midterms themselves are a significant upcoming event affecting many people.
2 Policy Expert The story reports prediction market odds, poll summaries, and a Speaker's criticism of polling, none of which is a concrete governmental action, so it is mostly commentary on an upcoming election a week away.

Sources (2)

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