The 2026 U.S. midterms are drawing renewed attention to prediction markets
16 September 2026
The 2026 U.S. midterms are drawing renewed attention to prediction markets, as major platforms and smaller exchanges position for higher activity this fall. The two dominant players in the space, Polymarket and Kalshi, are seeing a surge in trading volume. According to CNBC, daily notional volume is now consistently in the millions.
US midterm election prediction market wagers have already hit $133 million, according to independent analysts. That's up from $92.4 million in the 2022 cycle. Forecasts suggest total bets on this year's races could approach $1 billion.
Currently, Kalshi's U.S. Senate market shows a 54% chance of a Democratic victory, compared to 46% for Republicans. On the House and Senate balance-of-power market, top platforms differ slightly:
However, the surging interest in election wagering has raised concerns. Investigative reports indicate the markets are susceptible to manipulation, with thousands of congressional-race markets on Kalshi, Polymarket and other platforms.
Analysts found that significant odds movements can occur from relatively small bets. Some warn that strategic wagers could potentially influence betting lines. They point to broader concerns about election integrity.
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Prediction market firms argue that market forces and arbitrage opportunities help correct distorted odds. But regulatory scrutiny is intensifying.
The legal landscape remains complex, with many states maintaining prohibitions on election betting. Court challenges continue regarding whether prediction platforms should be treated as unlicensed gambling operations. The financial stakes are rising, with hundreds of millions projected to change hands.
The growing influence of prediction-market forecasts could impact races and public perceptions. If wagering activity continues expanding, the industry may approach mainstream status as an election forecasting tool. That development would come with both promise and challenges.
As attention focuses on U.S. politics, political prediction markets are reaching a potential turning point. The increased trading volume could establish election wagering as a political forecasting tool. Alternatively, concerns about manipulation and regulation may limit these markets' influence. This debate looks set to continue through the 2026 election season.