New Mexico Tribes and Heinrich Press Senate to Rein In Prediction Markets

New Mexico's gaming tribes have taken their fight against online prediction markets to Capitol Hill. In July 2026, U.S. Senator Martin Heinrich joined more than a dozen of the state's tribes and pueblos in urging the Senate to write explicit limits on prediction-market platforms into pending gambling-related legislation, warning that the fast-growing venues pose what the coalition called an existential threat to tribal sovereignty and to the revenue that funds tribal governments.

The appeal escalates a dispute that has already moved through the courts. Earlier in 2026, several New Mexico tribes sued the prediction-market operator Kalshi, arguing that its sports-outcome contracts amount to unlicensed sports betting offered across tribal jurisdictions in violation of the state's tribal-state gaming compacts. The New Mexico Attorney General followed with a suit of his own, and the Commodity Futures Trading Commission—the federal agency that regulates the contracts—countered that neither the state nor the tribes have jurisdiction over federally overseen markets.

Why prediction markets alarm tribal governments

The stakes for tribes run to the core of how tribal gaming is structured. Tribal casinos operate under a framework in which a state grants a measure of market exclusivity in exchange for compact terms, and that exclusivity is what makes many compacts economically viable. Prediction markets that let users take positions on sporting events reach players anywhere with a phone, without a compact, a license or a revenue-sharing arrangement. If those contracts are treated as lawful nationwide, tribes argue, the exclusivity they bargained for is hollowed out—along with the payments and services it supports. We examined that legal collision in our analysis of how prediction markets test tribal exclusivity under IGRA.

The coalition's core argument is simple: a platform that reaches every phone without a compact erodes the exclusivity that tribal gaming was built on.

The New Mexico coalition's letter asks senators to do two things: bar the platforms from enabling sports wagering, and state plainly that the contracts cannot be used to circumvent existing tribal-state compacts. The framing is deliberate. By tying the request to sovereignty and to obligations the federal government itself negotiated, the tribes are pressing lawmakers to treat prediction markets as a compact-integrity problem rather than a narrow commodities question.

A federal-versus-tribal jurisdiction clash

The countervailing argument is jurisdictional. The CFTC's position—that federally regulated event contracts sit outside state and tribal gaming authority—has become the central fault line in litigation across several states, and courts have not spoken with one voice. Appellate judges hearing related California cases have pressed operators hard on why sports-outcome contracts should not be treated like the wagers they resemble, but no definitive national answer has emerged. We tracked the agency's stance and the tribal response in our report on the CFTC's prediction-market rulemaking and the tribal rebuke.

New Mexico offers a sharp case study because its compacts currently authorize only in-person sports betting on tribal land. That has prompted a parallel idea inside the state: reopening the class III compact that governs New Mexico's gaming tribes to add regulated online sports betting, giving tribes a lawful mobile product to compete with the platforms rather than only litigating against them. That approach would take time and negotiation, but it reflects a recognition that prohibition and competition may need to advance together.

What to watch

The Senate push is unlikely to resolve quickly, and its fate is tied to whatever larger legislative vehicle it attaches to. But the New Mexico effort matters beyond the state because it reframes prediction markets as a test of whether Congress will protect the compact system it created. Tribes elsewhere are watching to see whether the sovereignty argument gains traction where the courtroom fight has so far produced mixed results. For the operators and markets that stand to be affected, our national gaming directory maps the tribal facilities whose economics depend on the answer.

A test case with national reach

New Mexico is not alone, and that is precisely why its campaign carries weight. Tribes and state regulators in several jurisdictions have opened parallel fronts against prediction-market operators, and appellate courts weighing the same questions have so far declined to hand either side a decisive win. Because the contracts are marketed as federally regulated financial products rather than bets, the dispute pits two bodies of law against each other: the commodities framework that governs event contracts and the gaming framework built on tribal-state compacts. Until a higher court or Congress reconciles the two, operators will keep pressing into new states and tribes will keep responding case by case.

The New Mexico coalition's decision to lobby the Senate rather than wait for the courts reflects a calculation that legislation, not litigation, offers the cleaner fix. A court ruling binds only the parties and circuit before it; a statutory carve-out that expressly protects compacts would apply nationwide. That is a heavier lift politically, but it is also the only remedy that would settle the question for every tribe at once—which is why a state-level fight in New Mexico has become a proxy for the industry's broader anxiety about where the compact system stands.