Prediction markets and polling models are converging on a Democratic takeover of the U.S. House with one week remaining before the Nov. 3 midterm elections, while control of the Senate remains a closer contest that could determine how easily either party advances legislation affecting cryptocurrency policy, spending and market oversight.
Polymarket priced Democrats’ chance of winning the House at 92%, with a projected 236 of the chamber’s 435 seats. Its Senate market gave Democrats a 67% chance of control, with 52 seats projected. Kalshi showed nearly identical House odds, placing a Democratic win at 91% and estimating 234 seats, while giving Democrats a 64% chance of winning the Senate with 52 seats.
The gap between the two chambers reflects the arithmetic of the current Congress. Republicans held the House 220-215 as of Oct. 15, according to Inside Elections, leaving Democrats three seats short of a majority. The Senate stood 53-47 for Republicans, requiring Democrats to gain four seats. A 50-50 Senate would remain under Republican control because Vice President J.D. Vance would cast the deciding vote.
Markets see a Democratic House as the most likely outcome
Polymarket’s balance-of-power market placed the likelihood of Democrats taking both chambers at 66%. The next most likely result was divided control, with Democrats winning the House and Republicans retaining the Senate, at 27%. A Republican sweep of both chambers was priced at 8%.
Polling and independent forecasting models have broadly reinforced the House outlook without producing the same degree of agreement on the Senate. Silver Bulletin’s model gave Democrats a 92% chance to win the House and a 76% chance to win the Senate. A Yale political science forecasting tracker showed a far broader range: Democratic House probabilities ran from 68% to 95%, while Senate probabilities ranged from 37% to 69%.
A Reuters/Ipsos poll completed Oct. 26 found 47% of registered voters intended to support Democratic candidates, compared with 36% for Republican candidates. Eleven percent said they were undecided. Once undecided respondents were allocated based on their stated partisan leanings, the split moved to 50% for Democrats and 41% for Republicans. Among respondents classified as most likely to vote, Democrats led 53% to 44%.
President Donald Trump’s approval rating had risen to 32% from a recent low, according to a separate update cited in the report. Aggregated approval measures placed his net approval between minus 19 and minus 27 points, compared with minus 11.7 points in October 2018, the last midterm cycle under a Republican president.
These figures offer a favorable national environment for Democrats, though House and Senate results will ultimately turn on district-level and state-level races rather than the national ballot alone. The Senate’s state-by-state map also makes a Democratic majority harder to secure than a House majority, even where the party has a national polling lead.
Congressional split would complicate crypto legislation
The election has drawn particular attention from crypto policy advocates because House and Senate control could shape the pace of market-structure legislation, agency oversight and federal appropriations.
The CLARITY bill, which would establish a more defined U.S. framework for digital-asset markets, faces different political paths depending on the result. Democratic control of both chambers could slow a renewed push for the measure, especially if lawmakers seek stronger consumer-protection provisions or a different division of authority between the Securities and Exchange Commission and Commodity Futures Trading Commission. A Republican sweep could create a clearer route for restarting the legislation, although committee negotiations and Senate procedure would remain material hurdles.
A divided Congress could produce the most difficult route for expansive legislation. Democrats controlling the House would gain authority over committee agendas, hearings and investigations, while a Republican Senate could block or amend House-passed bills. That arrangement would also place pressure on agencies and industry executives through more aggressive oversight, even without immediate statutory changes.
Morgan Stanley wrote in an Oct. 14 note that tariffs, taxes and regulation are often driven primarily by the executive branch, while changes in congressional control can increase investigations and disputes over federal budgets. Its historical analysis found that the S&P 500 averaged a 23% gain in the second year following midterms with a Republican president and split Congress. Under a Republican president and a Democratic-controlled Congress, the average gain was 15%.
Those historical returns do not provide a forecast for Bitcoin or crypto-linked equities, which remain influenced by liquidity conditions, digital-asset demand, company-specific balance sheets and regulatory announcements. They do illustrate why markets often focus less on party control alone than on whether Washington is likely to produce major policy changes or prolonged legislative conflict.
December funding deadline adds another pressure point
Citi’s early-October note identified Dec. 11 as the deadline for temporary federal funding. A House majority change could reshape budget negotiations quickly after the election and increase the possibility of a government shutdown if the parties fail to agree on spending terms.
A shutdown would not automatically alter crypto rules, but it could delay congressional work and restrict normal operations at federal agencies. That could affect the timing of enforcement actions, rulemaking, registration reviews and policy consultations involving financial regulators.
Campaign spending indicates that digital-asset businesses and executives see congressional control as a direct business issue. A Washington Post tally found that the top 50 donors in the 2026 cycle had contributed $2.77 billion: $1.67 billion toward Republican-aligned efforts, $832 million toward Democratic-aligned efforts and $264 million to special-interest groups.
The tally listed Elon Musk as the largest individual donor, at roughly $446 million, largely supporting Republican candidates through super PACs and affiliated groups. Among crypto-linked contributors, Coinbase gave about $57.8 million, Ripple contributed about $49.6 million, and Gemini co-founders Cameron and Tyler Winklevoss gave a combined $55.9 million. Foris Dax was listed at $39 million. Coinbase and Ripple were classified as special-interest donors, while the other named crypto-linked parties were listed as Republican donors.
The scale of those contributions reflects an industry seeking more predictable rules after years of policy disputes. Election outcomes will not settle that debate overnight, but the House result appears positioned to decide whether crypto legislation faces a new set of gatekeepers or a more favorable path through Congress.
For deeper insight into policy shifts and market impact, explore our outlook in this election-crypto analysis.
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