House betting volume leads Kalshi midterms as Democratic odds reach 94 percent
OddsChecker reports Kalshi's House control market opened on May 27 with Democrats at 76 percent and had become the most heavily traded midterm market on Kalshi, with about 157 million dollars traded as of October 28. It puts Democrats at about 94 percent on Kalshi and 95 percent on Polymarket for the House on Election Day, with a Democratic sweep of both chambers the single most likely outcome at around 75 percent.
Kalshi’s market on control of the House has become its most heavily traded midterm market, with about 157 million dollars traded as of October 28, according to OddsChecker.
The market opened on May 27 with Democrats at 76 percent. OddsChecker’s Election Day figures put the party at about 94 percent on Kalshi.
House odds align across platforms
Polymarket puts Democrats at 95 percent to win House control on Election Day, according to OddsChecker. That places the two platforms’ reported probabilities close together, with both strongly favoring a Democratic victory in the chamber.
The reported trading total and Election Day probabilities reflect different snapshots. The volume figure runs through October 28, while the House odds describe Election Day positioning in the report published Nov 3, 2026, at 6:45 PM ET.
Democratic sweep ranks first
Beyond the House, OddsChecker identifies Democratic control of both chambers as the single most likely outcome, at around 75 percent.
That sweep probability remains below the reported odds of Democratic House control alone. The figures distinguish a strong expectation for one chamber from the less certain prospect of winning both.
What it means for prediction markets
- Activity is concentrated in House control: About 157 million dollars in trading through October 28 made it Kalshi’s leading midterm market by volume.
- Democratic expectations have strengthened: Kalshi’s reported House probability moved from 76 percent at the May 27 opening to about 94 percent on Election Day.
- Platforms show similar House expectations: Kalshi’s roughly 94 percent and Polymarket’s 95 percent point in the same direction, without making the outcome certain.
- A sweep is a separate proposition: The roughly 75 percent probability for Democratic control of both chambers is lower than the House-only estimates.
Sources & attribution
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- OddsCheckeroddschecker.com
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- https://www.oddschecker.com
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Full attribution under the Digital Millennium Copyright Act (DMCA), 17 U.S.C. § 512: this article is an original report by Infiniti Intelligence that summarizes the reporting of the publishers named above, links to their original work, and reproduces no protected expression beyond brief factual reference and in-line attribution (“according to OddsChecker”). All rights in the underlying reporting remain with the publishers listed; nothing here implies endorsement by or affiliation with them. Rights holders may request correction, update or removal through the contact address published at infiniti.w3ai.io.
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