Senators Lock Themselves Out of the Polymarket Casino — and Hand the Industry a PR Win

 The resolution covers senators and Senate staff only — not House members, not the executive branch, not the Federal Reserve, not the rest of official Washington. It also doesn’t reach into the prediction-market platforms themselves, which under federal commodities law remain CFTC-regulated derivatives exchanges. What it does is close the most obvious self-dealing channel: a senator who knows what’s about to drop in committee placing money on whether it drops.

“United States Senators have no business engaging in speculative activities like prediction markets while collecting a taxpayer-funded paycheck, period,” Moreno said in a statement accompanying the vote. “Serving in Congress is an honor, not a side hustle.” Minority Leader Chuck Schumer, in floor remarks reported by Politico, called the action “a good thing” and pushed Speaker Mike Johnson and the White House to follow with parallel restrictions for the House and the executive branch.

Both major prediction-market operators came out swinging for the bill. Kalshi founder Tarek Mansour posted on X that the Senate’s move was “a great step to increase trust in our markets,” noting that Kalshi already proactively blocks members of Congress and enforces against insider trading internally. He urged the House to pass equivalent language. Polymarket’s official account echoed the line, saying the company is “in full support” because its existing Rulebook and Terms of Service already prohibit the conduct, and that “codifying this into law is a step forward for the industry.”

That alignment isn’t a coincidence. The single biggest commercial risk to platforms now valued in the tens of billions of dollars — Polymarket is in talks at $12-15 billion, Kalshi closed its last round at $11 billion — is the perception that they are venues for political insiders rather than legitimate forecasting tools. Every time a pseudonymous wallet on Polygon turns out to belong to someone with classified clearance, the case for federal preemption against the state attorneys general circling the industry gets harder. The platforms would rather lose a few dozen Capitol Hill traders than continue absorbing those headlines.

The catalyst sits in plain view. In late January, a pseudonymous Polymarket account placed roughly $400,000 in winning bets on a market asking whether Venezuelan President Nicolás Maduro would be “out” by the end of the month. The position settled in the trader’s favor when Maduro abruptly stood down. Last week, federal prosecutors arrested Gannon Ken Van Dyke, a 38-year-old active-duty US Army soldier, and charged him with using classified information to place those bets. Van Dyke pleaded not guilty earlier this week, but the timeline — military source, Latin American policy event, six-figure crypto-settled payout — became the textbook case study Moreno and his co-sponsors needed.

State governments had already started moving. California Governor Gavin Newsom signed an executive order in March barring state employees from using non-public information on prediction-market platforms. New York and Illinois followed in April with similar orders, and Tennessee escalated by issuing cease-and-desist letters to Kalshi, Polymarket and Crypto.com over unlicensed sports-betting concerns earlier this year. The federal vacuum at the legislative-branch level had become conspicuous. S. Res. 708 fills it for one chamber.

The more interesting omission is at the Federal Reserve. Kevin Warsh, whose nomination to succeed Jerome Powell as Fed chair advanced through the Senate Banking Committee on Tuesday, disclosed personal exposure to both Solana and Polymarket in his confirmation paperwork. The disclosure is legal, the holdings are not large in the context of Warsh’s net worth, and Fed officials are already subject to their own ethics framework that was tightened after the 2022 trading scandal. But the optics of an incoming chair holding positions on a platform where users can bet directly on FOMC rate decisions are, charitably, awkward. Moreno’s resolution does not touch this.

Neither does it touch the prediction markets where the decisions actually matter. Polymarket’s “Fed rate cut by year-end 2026” market is currently pricing roughly 12% odds, having drifted lower through April as oil prices held above $100 a barrel and the FOMC delivered Powell’s third consecutive hold. Kalshi runs equivalent contracts under CFTC supervision. Information about what the Fed is going to do remains tradable, and the people who know first remain unrestricted.

In the near term, this is unambiguously bullish for prediction markets as a category. The platforms get federal validation that their core regulatory framework — CFTC-supervised event contracts — is being treated as something that needs to be protected from insiders rather than dismantled. Kalshi and Polymarket can point to S. Res. 708 in every state-court filing for the next eighteen months as evidence that Congress views the venues as legitimate financial markets, not unlicensed sportsbooks.

The harder question is enforcement. The resolution sets a rule but creates no new monitoring infrastructure. Senate offices will be expected to self-police, supplemented by whatever surveillance the platforms already run on their own data. Kalshi’s claim that it pre-emptively blocks members of Congress is checkable; Polymarket’s smart-contract architecture, with users trading from self-custodied wallets, is harder to police, and the company’s recent acquisition of QCEX and migration toward a fully regulated US framework is partly a response to exactly that gap.

For now, the Senate has done the easy version: ban itself from a market it doesn’t really play in, and pass the harder questions — the House, the executive branch, the Fed, and what to do about the wallets that don’t have names attached — to whoever comes next. Industry got the headline it wanted, and the actual insider problem remains where it was on Tuesday.