Regulated prediction market Kalshi has priced a Democratic sweep of the U.S. government in the 2028 elections as the most likely outcome, assigning it a 49% probability. This market valuation indicates that traders believe Democrats have nearly even odds of winning the presidency while retaining control of both the House of Representatives and the Senate. The finding highlights shifting sentiment in financial markets regarding political stability and partisan control ahead of the next election cycle.

By comparison, a Republican sweep—where Republicans capture the presidency and both chambers of Congress—is priced at just 20%. The third-most likely scenario, occurring with a 12% probability, involves a split government where Democrats win the White House and the House while Republicans retain the Senate. Other outcomes, including a Republican president facing a divided Congress or a Democratic president with Republican control of one or both chambers, trail in single-digit probabilities.

Market Mechanics and Pricing

Kalshi operates as a regulated platform where participants buy and sell contracts tied to specific future events. The pricing of these contracts serves as a proxy for implied probability. A "Yes" contract pays $1 if the predicted outcome occurs and $0 if it does not. Consequently, contract prices directly reflect the market's assessment of likelihood.

At the time of reporting, a "Yes" contract for a Democratic sweep was trading at approximately 50 cents, while the corresponding contract for a Republican sweep traded near 20 cents. These prices fluctuate continuously as new information becomes available, distinguishing prediction markets from static opinion polls or official forecasts.

Regulatory Context

The market data emerges against a backdrop of ongoing legal challenges to executive actions on voting procedures. Last week, a federal appeals court kept in place an injunction blocking key provisions of President Donald Trump’s executive order aimed at increasing oversight of mail-in voting before the upcoming midterm elections. The lawsuit, filed by Democratic-led states including California, Massachusetts, and Washington, argued that the executive order exceeded presidential authority. While this legal development pertains to current electoral administration, it underscores the contentious political environment influencing long-term market expectations for 2028.

Kalshi, a next-generation financial exchange, has launched the Midterms Hub, a dashboard combining live odds, polling averages, fundraising data, and historical results for every Senate, House, and gubernatorial race. The platform highlights that Republicans now have a 56% chance of keeping the Senate, a decline from a 67% chance at the start of the year and over 80% a year ago. The slide reportedly accelerated following the U.S.-Iran conflict earlier this year. The House outlook appears even more challenging for the GOP, with traders giving Democrats roughly an 83% chance of flipping the chamber.

The hub operates on a 24/7 basis, updating odds in real time as news breaks, debates occur, and polls are released. Kalshi asserts that its prediction markets are well-calibrated, noting that events priced at a 70% probability occurred about 70% of the time. Data from U.S. elections since 2024 indicates that when Kalshi's markets favored a candidate, that candidate won approximately 9 times out of 10. According to the company, roughly 75% of visitors to the site check the odds, while 25% actively trade.

Key Features of the Midterms Hub

The Midterms Hub integrates several data streams to provide a holistic view of the election landscape. The following table outlines the primary components available to users:

Strategic Context and Valuation

The launch builds on Kalshi's previous release of KPOW, the American Power Index, which blends current power structures with future market expectations into a single metric. "Prediction markets don't care about spin or partisanship. They cut through polarization and show you what the wisdom of the crowds actually believes, backed by real money, not rhetoric," said Tarek Mansour, co-founder and CEO of Kalshi.

Traders across Kalshi and rival Polymarket have already put nearly $200 million behind midterm outcomes. Annualized revenue reportedly passed $2 billion in June, up from roughly $650 million last November. The company is reportedly exploring a raise at a valuation as high as $40 billion, nearly double the $22 billion set by May's Coatue-led Series F. Mansour has reportedly ruled out an IPO this year.