Prediction Markets Put Democrats Ahead in 2026 Midterms

Traders on the prediction platforms Polymarket and Kalshi are pricing a Democratic sweep of both the House and Senate in the 2026 midterm elections as the most likely outcome. Combined volume across the two markets is about $12.6 million.

Polymarket’s “Balance of Power: 2026 Midterms” market has recorded $7,038,176 in trading volume. The market prices a Democratic sweep at $0.47, implying a 47% probability. The combination of a Republican Senate and Democratic House is priced near $0.34 (34%), a full Republican sweep around $0.19 (19%), and a Democratic Senate with a Republican House at about $0.017 (1.7%).

Kalshi’s market, which settles on congressional control as of Feb. 1, 2027, has drawn $5,546,744. Traders there place a Democratic sweep at roughly 45%, a Democratic House with a Republican Senate at about 31%, a full Republican sweep at 25%, and a Republican House with a Democratic Senate near 1.8%.

Both markets resolve based on official congressional records or certified election results, providing a clear settlement mechanism tied to the final outcome of the 2026 elections.

Mid-May tracking shows President Donald Trump’s approval in the mid-30s, with disapproval notably higher. National generic ballot averages during the same period put Democrats ahead by roughly five to seven percentage points.

If Democrats win both chambers, they would take control of committee assignments and subpoena power in both the House and Senate. The reconciliation process, which requires only a simple Senate majority to pass certain budget-related legislation, would not be available to Republicans. Senate Democrats would be able to use procedural tools to slow or block executive branch nominees. Control of the House would give Democrats authority over appropriations and could affect funding negotiations and debt ceiling votes during the remainder of the presidential term.

Historically, the party holding the presidency tends to lose House seats in midterm elections. The Senate map for 2026 requires Democrats to gain seats in order to take control; Republican defenses on that map are a factor cited by market participants. Independent voters who moved toward Republicans in 2024 have shown less support for both the president and congressional Republicans in recent surveys.

At present, the implied probabilities and roughly $12.6 million in combined liquidity indicate that the single most likely outcome priced by traders on both platforms is a Democratic sweep of the House and Senate for the 2026 midterms.