Senators block prediction market trading to prevent political ethics conflicts

In a rare display of bipartisan urgency, US senators voted unanimously on May 22, 2026, to amend the chamber’s conflict-of-interest rules and prohibit members from placing bets on political prediction markets. The decision comes after Kalshi, a leading prediction market platform, flagged that three congressional candidates had traded on their own campaigns—raising concerns about potential conflicts between public service and personal profit.

A swift response to ethical concerns

The resolution, introduced by Senator Bernie Moreno of Ohio, passed without opposition under unanimous consent. Unlike traditional legislation, the measure does not require approval from the House of Representatives, as it amends rules governing Senate conduct. Meanwhile, the House is advancing a parallel resolution, spearheaded by Representative Dina Titus of Nevada, which would impose equivalent restrictions on its members.

Moreno framed the urgency in stark terms. “Serving in Congress should never be about finding new ways to profit; it should be about delivering results for the American people,” he stated in an official press release. The senator emphasized that senators, who receive taxpayer-funded salaries, have a fundamental obligation to avoid speculative financial activities that could undermine public trust.

The rise and risks of political prediction markets

Prediction markets like Kalshi and Polymarket allow users to wager on a wide range of outcomes, from election results to policy decisions. While proponents argue such platforms provide valuable crowd-sourced insights, critics warn they create perverse incentives—particularly when participants stand to gain financially from political events they influence.

Kalshi’s internal review uncovered that candidates in recent campaigns had placed bets on their own races, a direct conflict with the principle of impartial public service. The company voluntarily reported these cases to regulators, sparking bipartisan outrage and accelerating the legislative response.

The Senate’s move reflects growing unease over the intersection of politics and speculative finance. Similar concerns have surfaced in other contexts, such as insider trading allegations against members of Congress, which led to the 2022 STOCK Act—barring lawmakers from profiting on non-public information.

What’s next for Congress and prediction markets?

With the Senate’s rule change now in effect, affected senators must divest any existing positions in prediction markets. Violations would trigger disciplinary procedures under the Senate Ethics Manual, though the resolution does not specify penalties. The House’s pending resolution is expected to undergo markup in June 2026, with a vote anticipated before the summer recess.

Industry observers suggest the crackdown may curb participation in political prediction markets among elected officials. Kalshi, which operates under a Commodity Futures Trading Commission (CFTC) license, has not yet indicated whether it will revise its user policies beyond the current compliance checks.

For the American public, the development signals a step toward greater transparency in government. Whether it reshapes broader attitudes toward political wagering remains to be seen—but it has undeniably drawn a line between public service and personal gain.