Recent New York Times and Siena University polling prompted a sharp reassessment among Kalshi participants, reversing Republican momentum that had persisted since markets opened in 2024. The political turnaround extends beyond the national chamber to individual state races, boosting Democratic odds significantly in Texas, Iowa, and Kansas. However, because these platforms reflect speculative trading volumes rather than traditional scientific polling methodologies, experts caution against viewing the probabilities as direct election forecasts.
Key points
The Library of Congress will officially verify the final outcome to settle the Senate con…: The Library of Congress will officially verify the final outcome to settle the Senate control contract after Tuesday's election.
Favorable numbers from a New York Times and Siena University battleground poll sparked th…: Favorable numbers from a New York Times and Siena University battleground poll sparked the massive market shift toward Democrats.
Prediction market probabilities rely entirely on trading activity and do not serve as sci…: Prediction market probabilities rely entirely on trading activity and do not serve as scientific substitutes for traditional political polls.
Sources checked by our analysis pipeline: 1
Momentum for Democrats is building on Kalshi, with traders on Monday seeing a 74% chance of the party winning control of the Senate — the highest odds seen for the party on the platform since the market first opened.
The higher odds come after a New York Times and Siena University poll found Democrats are leading in several battleground states, strengthening Democrats' path to a possible Senate majority. The contract asks, "Who will control the Senate?", and will be verified by the Library of Congress after Tuesday's vote.
Since the market first opened in 2024, Republicans dominated the market for Senate control in 2026. The gap between the parties' odds narrowed shortly after the U.S. and Israel first launched strikes on Iran on Feb. 28, though the chances for Republican control jumped up to 60% in July before reversing in mid-September.
Markets on separate Senate races have also seen major movement in favor of Democratic candidates in the last 24 hours. Traders on Kalshi now see a 74% chance of Democrats winning the Texas Senate race, up from 68.4%, over…
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