Democratic congressional sweep odds rise as prediction markets favor unified control
Kalshi's balance-of-power market put the chance of Democrats winning both the House and Senate at about 70 percent on Sunday morning, up from below 50 percent in early September, with a split Congress at 27 percent and a Republican sweep at 6.7 percent. Polymarket priced a Democratic sweep at 72 percent, a split Congress at 23 percent and a Republican sweep at 5 percent.
Democrats winning both the House and Senate stood at about 70 percent in Kalshi’s balance-of-power market on Sunday morning, according to TradingView. Polymarket priced the same outcome at 72 percent ahead of the midterms.
Democratic control gains ground
Kalshi’s Democratic sweep probability had risen from below 50 percent in early September, according to TradingView. The move put control of both chambers clearly ahead of the other reported outcomes.
A split Congress was priced at 27 percent on Kalshi, while a Republican sweep stood at 6.7 percent.
Platforms agree on the leading outcome
Polymarket also ranked a split Congress second, at 23 percent, followed by a Republican sweep at 5 percent. Both platforms therefore favored Democratic control of both chambers, though their prices differed across all three outcomes.
The reported Kalshi figures total more than 100 percent, while Polymarket’s total 100 percent. The supplied summary does not explain the difference, limiting direct comparisons of the full outcome sets.
What it means for prediction markets
- The main shift is on Kalshi: Democratic sweep odds moved from below 50 percent in early September to about 70 percent on Sunday morning.
- The platforms share an outcome ranking: A Democratic sweep leads, a split Congress follows, and a Republican sweep has the lowest reported probability.
- Prices are not results: The figures reflect market assessments ahead of the midterms, not confirmed congressional control.
Sources & attribution
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- TradingViewtradingview.com
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- https://www.tradingview.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 TradingView”). 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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