What is an election prediction market?
An election prediction market is an exchange where traders buy and sell contracts that pay a fixed amount, often $1, if a specified outcome occurs, such as a particular candidate winning the presidency or a party taking the House. The current trading price, between zero and one dollar, is widely interpreted as the market's implied probability of that outcome. Backers describe the contracts as financial instruments similar to commodity futures; skeptics describe them as a form of gambling on politics.
How U.S. law has treated them
For most of the last two decades, federal regulators have kept election betting on a short leash. The Commodity Futures Trading Commission, which oversees derivatives, has repeatedly rejected proposals for election-outcome contracts on regulated U.S. exchanges, citing concerns about election integrity and the difficulty of detecting insider trading across thousands of federal, state and local races. A small academic exchange, the Iowa Electronic Markets, has operated for years under a narrow no-action letter with low position limits.
The 2024 Kalshi ruling
In 2024, a federal appeals court allowed the CFTC-regulated exchange Kalshi to list contracts on which party would control each chamber of Congress, rejecting the agency's attempt to block them. The decision did not bless every possible election contract, but it signaled that the CFTC's authority to prohibit such markets is narrower than the agency had argued. Kalshi went on to offer contracts on the presidential race later in the cycle.
Polymarket and offshore activity
Polymarket, a crypto-based prediction platform, is not licensed to serve U.S. customers and previously settled with the CFTC over unregistered activity. Even so, industry data cited by Reuters showed more than $3.7 billion in volume on its U.S. election-related contracts during the 2024 presidential cycle, illustrating how much trading occurs outside the U.S. regulatory perimeter and complicating any single-country policy response.
The case for legalizing them
Supporters argue that prediction markets aggregate information from many participants faster than traditional polls and incorporate breaking news in real time. They say legal, regulated U.S. exchanges would bring transparency, customer protections and tax reporting to activity that is already happening offshore. Some economists also argue the markets can be useful hedging tools for businesses, journalists and campaigns whose finances are affected by election results.
The case against
Critics, including past CFTC majorities and some election officials, argue that putting money on election outcomes creates financial incentives to manipulate campaigns, spread disinformation or suppress turnout in pivotal precincts. They note that unlike stock markets, prediction markets lack a uniform federal insider-trading statute; enforcement relies on each platform's contract terms and the CFTC's general anti-manipulation rules. Opponents also worry that market prices, even when wrong, can shape media narratives and voter behavior.
What is still unsettled
Key questions remain open: whether Congress will write specific rules for event contracts, how aggressively the CFTC will police manipulation, whether state gambling laws apply, and how to handle foreign-based platforms accessible by U.S. users. Voters weighing the issue are essentially deciding how to balance the informational value supporters claim against the integrity risks critics emphasize.