Just 1% of wallets control $133M in midterm odds on Polymarket, creating a dangerous illusion of mass public consensus

The Nov. 3 midterm election is less than 11 weeks away, and its betting market had already surpassed the full 2024 congressional cycle in the latest comparable data.

Traders had placed at least $133 million across markets tied to House and Senate races by Aug. 10, compared with $92.4 million during all of 2024. The menu expanded from 464 comparable congressional markets to 7,466, covering primaries, vote shares, turnout, endorsements, candidate remarks, and winners.

The top-line volume makes election betting look huge, but the participation data shows something narrower. On Polymarket Global, the top 1% of wallets account for 68% of congressional volume. Ten wallets alone produce 17% and have traded contracts touching 426 of the 470 seats on the ballot.

Prediction markets are becoming part of how everyone from campaigns and donors to media outlets interpret elections before the people vote. They're reaching that role while a small pool of capital still sets much of the displayed probability, and enforcement expands one case at a time.

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