Warren and Curtis demand election wager data from Kalshi and Polymarket

Senators Elizabeth Warren and Tom Curtis sent letters to Kalshi and Polymarket this week demanding detailed information about election-related contracts — who traded them, how much moved, and whether candidates or their campaigns held positions on their own races.

The letters land at a specific moment. Midterm election contracts have already cleared more than a billion dollars in notional volume, and separate reporting has documented candidates placing wagers on their own outcomes. Warren has been the more persistent voice on platform accountability; Curtis brings Republican cover that makes this harder for Kalshi's defenders to dismiss as partisan interference. Two senators from opposite caucuses asking the same question in the same week is not routine oversight — it is the shape of something building.

Kalshi will argue, as it has in every state proceeding, that CFTC authorization governs what it can offer and to whom. That argument has worked in federal court. It has not resolved the political problem, and the political problem is now arriving on a different track. Congressional oversight does not require a legal theory. It requires a subpoena and a hearing date.

What Warren and Curtis are after is the investor and customer data — specifically whether the Platinum program's high-volume traders include people with material, nonpublic knowledge of electoral outcomes. The CFTC has named insider trading its stated priority for prediction markets. If the Senate letters surface trading patterns the agency cannot ignore, the commission's enforcement posture could move faster than its rulemaking posture. Those two speeds have not been synchronized in this sector.

Polymarket's situation is structurally different and in some ways more exposed. The company is already under a reopened CFTC probe into whether it violated a 2022 settlement agreement by allowing banned U.S. users to access the platform. A congressional demand for election trading records, arriving while that probe is live, creates a document production problem with no clean path through it. Cooperate fully and you hand the agency material it may not have reached on its own timeline. Decline and you have a Senate committee writing the next press release about your conduct.

The consensus read is that this is pressure theater — letters that generate headlines and may eventually generate hearings, but that stop short of legislation because neither party has the votes to define what a legal election contract looks like. I don't think that's where this lands. The record-production demands from New York, the criminal exposure of Kalshi's founders in Utah, and now bipartisan Senate scrutiny of election trading data represent three separate institutions developing an evidentiary record about the same companies at the same time. The legal preemption argument protects Kalshi from state enforcement. It does not protect Kalshi from a congressional referral to the CFTC, and it does not protect either platform from the political cost of whatever those records contain.