CFTC preemption argument faces its sharpest test yet in Missouri

A cease-and-desist letter landed in Kalshi's legal inbox with a deadline of October 16 and two options: stop operating in Missouri, or obtain a state gambling license, pay state taxes, and restrict access to users under 21. Kalshi's answer was a federal lawsuit.

Missouri Attorney General Catherine Hanaway's position is not casual. Her office argues that Kalshi's event contracts are indistinguishable from sports wagers — that the label "prediction market" changes nothing about what a bettor is actually doing when they stake money on an NFL game's outcome. And she has framed Missouri's stance as consistent with the majority of federal courts that have considered the question. That framing deserves scrutiny, because it is doing a great deal of work.

Kalshi's lawsuit rests on two pillars. The first is the Commodity Exchange Act's grant of exclusive jurisdiction to the CFTC over swaps traded on designated contract markets. The second is the Supremacy Clause. Together, they say: this is a federal instrument, regulated by a federal body, and a state cease-and-desist letter cannot reach it. I have seen this argument succeed and fail in the same twelve-month period at different circuit levels, which tells you the doctrine is genuinely unsettled rather than moving in one direction.

The harder question — the one Hanaway's office is actually pressing — is definitional. If Missouri can establish that Kalshi's sports-event contracts are bets rather than swaps under the CEA's own terms, the preemption argument collapses at its foundation. Federal preemption only extends as far as federal jurisdiction does. If the product falls outside the CEA's definitional scope, the Supremacy Clause is simply not in play. Missouri is not trying to override federal law. It is arguing that federal law never covered this product in the first place.

That is a narrower and more dangerous argument for Kalshi than the one they are prepared to fight. A court that accepts Missouri's definitional framing does not need to reach preemption at all.

The consensus read on markets tracking this litigation treats preemption as the central battlefield. I think that is the wrong frame. The central question is whether a federal court will accept Missouri's characterization of these contracts as sports wagers before it ever reaches the constitutional layer. If it does, Kalshi's federal shield does not protect them — not because the shield is weak, but because it was never raised in the right place.

The CFTC's own posture matters here. The Commission has moved to freeze Utah's criminal prosecution, which signals it views its jurisdictional authority as intact. But the CFTC has not resolved the definitional question about what qualifies as a swap with the precision a court would need to rule cleanly in Kalshi's favor. That gap is where Missouri is operating.