The Massachusetts Offensive

This morning, Polymarket filed a federal lawsuit in the U.S. District Court for the District of Massachusetts. The timing was not reactive. It was preemptive. Three days ago, on February 6, a Massachusetts state court ordered Kalshi to geoblock all users in the Commonwealth within 30 days. Twenty days before that, on January 20, Attorney General Andrea Joy Campbell secured an injunction halting Kalshi's sports event contracts in the state. Polymarket watched Kalshi absorb two consecutive legal losses and decided to file first.

The lawsuit asks a federal court to declare what Massachusetts state courts have refused to acknowledge: that prediction markets offering sports-linked contracts are federally regulated swaps under the Commodity Exchange Act, and that state gambling laws are preempted by exclusive CFTC jurisdiction. The legal argument is not new. The procedural posture is.

Polymarket is not waiting for Massachusetts to sue. It is suing Massachusetts before the state can act. The offensive strategy reflects a calculation about where the law is heading — a calculation that is itself a product of the rulings that preceded it. The regulatory war has become reflexive. Each court decision reshapes the next platform's legal strategy, which reshapes the next court decision.

The timeline

The Massachusetts sequence began on January 20, 2026. Attorney General Andrea Joy Campbell filed a complaint and motion for preliminary injunction in Suffolk County Superior Court, arguing that Kalshi was operating an unlicensed gambling platform in violation of state law. The state's argument turned on a specific fact: Kalshi allowed users as young as 18 to place sports-linked wagers in a state where the legal minimum for sports betting is 21. Judge Barry-Smith granted the preliminary injunction, finding that sports wagers represent over 80 percent of Kalshi's business and that the platform's classification as a derivatives exchange does not override Massachusetts consumer protection law.

On February 6, the same court issued a follow-up order: Kalshi must geoblock all Massachusetts users within 30 days. The clock is now running. Kalshi has until approximately March 8 to comply or appeal.

Polymarket's filing today preempts that sequence. By filing in federal court before Massachusetts can target Polymarket directly, the platform is attempting to establish the jurisdictional question on federal terms. The lawsuit names Andrea Joy Campbell in her official capacity and seeks declaratory judgment that the CEA grants the CFTC exclusive authority over sports-linked event contracts.

The legal theory is the same one Kalshi has advanced in 19 federal lawsuits across 11-plus states: that CFTC-approved event contracts are “swaps” under the CEA, that Congress intended federal preemption when it created the derivatives regulatory framework, and that state gambling classifications are inapplicable to federally regulated instruments.

The Nevada problem

Polymarket's lawsuit faces an immediate obstacle. On January 29, 2026 — eleven days ago — U.S. District Judge Andrew Gordon in Nevada ruled that the Commodity Exchange Act does not “automatically” grant the CFTC exclusive authority over event contracts. The ruling came in a case brought by the Nevada Gaming Control Board against Polymarket itself.

Judge Gordon's reasoning was narrow but significant. He held that while the CFTC has regulatory authority over derivatives, that authority does not necessarily preempt state gambling laws when the underlying product functions as a wager. The question of whether a specific contract is a bet or a swap, in Gordon's view, remains fact-specific. The CEA does not provide a blanket exemption.

This is the third federal ruling against the prediction market industry's preemption argument. Maryland went first, in the summer of 2025. Nevada followed, dissolving its own preliminary injunction. Now the January 29 ruling has sharpened the doctrinal stakes: the CEA's preemptive force is not automatic. It must be argued, contract by contract, state by state.

The only federal district court to rule in favor of preemption remains New Jersey, in April 2025. That ruling is now on appeal to the Third Circuit. If the Third Circuit affirms while the Fourth Circuit (Maryland) and Ninth Circuit (Nevada) reject the preemption argument, the resulting circuit split will almost certainly produce a Supreme Court petition.

The reflexive loop

What makes the Massachusetts lawsuit notable is not the legal arguments. Those are familiar. It is the procedural strategy — and what that strategy reveals about how the regulatory war is evolving.

Kalshi's approach, across 19 federal lawsuits, has been largely reactive. A state issues a cease-and-desist. Kalshi sues to block enforcement. A state court grants an injunction. Kalshi appeals. The posture is defensive: absorb the blow, then litigate.

Polymarket's Massachusetts filing inverts this. The platform watched the January 20 injunction and the February 6 geoblock order land on Kalshi. It observed the litigation trajectory. It filed first. The lawsuit asks a federal court to decide the preemption question before Massachusetts can build a state-court record against Polymarket.

This is reflexivity operating at the level of legal strategy. Kalshi's losses in Massachusetts shaped Polymarket's filing. Polymarket's filing will shape how Massachusetts responds. The state may now face a choice: litigate on two fronts against two platforms, or consolidate. The federal court's response to Polymarket's preemptive suit will shape how other platforms approach other states. Each ruling becomes an input to the next platform's strategy, which becomes an input to the next ruling.

The feedback loop is visible in the timeline. The January 20 Massachusetts injunction influenced the February 6 geoblock order. The February 6 order influenced today's federal filing. Today's filing will influence how the February 12 Connecticut hearing unfolds — Judge Victor Bolden will be aware that Polymarket has opened a second federal front in New England.

The Selig factor

Polymarket's lawsuit arrives ten days after CFTC Chairman Michael Selig withdrew the 2024 proposed rule (RIN 3038-AF14) that would have banned political and sports event contracts. Selig also withdrew Staff Advisory No. 25-36, which had cautioned platforms against offering sports contracts in states with pending litigation. He directed staff to draft new event contracts rulemaking and signaled that the CFTC would intervene in federal court to assert its exclusive jurisdiction.

The Selig Doctrine — as covered in Essay XIV — recharacterizes prediction markets from gambling to tools for “price discovery” and “information aggregation.” The recharacterization is regulatory philosophy, not binding law. But it creates an expectation that the CFTC will file amicus briefs or intervene directly in cases like Polymarket v. Campbell.

Polymarket's filing explicitly invokes CFTC authority. The complaint argues that the Commission's regulatory framework for event contracts is the exclusive source of oversight, that state gambling classifications represent an unconstitutional intrusion into federal regulatory space, and that the CEA's preemption clause should be read broadly. The argument tracks Selig's public statements almost verbatim.

Whether the CFTC actually intervenes remains uncertain. Selig controls the agency with one commissioner seated out of five. The enforcement division has been reduced to under 100 people. The capacity for coordinated intervention across 19 federal lawsuits is limited. But the signaling alone shapes the legal environment. Polymarket filed today because it believes Selig will back the preemption argument. The belief is itself an input to the filing. The filing will test the belief.

The state coalition

Massachusetts is not alone. The lawsuit lands in the context of a coordinated state opposition that has grown throughout 2025 and into 2026.

• ▸38 state attorneys general plus the District of Columbia have filed amicus briefs opposing Kalshi's preemption argument. The coalition is co-led by Ohio AG Dave Yost and includes both Republican and Democratic attorneys general.
• ▸19 federal lawsuits are currently pending against prediction market platforms across 11-plus states, with today's filing making it 20.
• ▸60-plus federally recognized tribes have joined amicus briefs or filed direct litigation, arguing that prediction markets violate tribal gaming compacts.
• ▸10 states have issued cease-and-desist orders against Kalshi: Nevada, New Jersey, Maryland, New York, Ohio, Arizona, Connecticut, Illinois, Michigan, and Montana.

Polymarket's lawsuit does not change this arithmetic. But it does change the posture. The platform is now an offensive litigant, not a defensive one. It is asking federal courts to restrain state enforcement authority before that authority is exercised. The states will respond. Their response will shape the next filing.

The structural question

The prediction market industry has operated since 2020 on a legal theory that remains untested at the Supreme Court: that CFTC-approved event contracts are derivatives, that derivatives fall under exclusive federal jurisdiction, and that state gambling laws are therefore preempted.

The theory has now been rejected in three federal district courts (Maryland, Nevada twice) and one state court (Massachusetts). It has been accepted in one federal district court (New Jersey). The scorecard is 4-1 against.

This is not a stable equilibrium. The circuit courts will rule in 2026. If the circuits split, the Supreme Court will likely take the case in its October 2026 or October 2027 term. The prediction market industry is building a $40 billion volume business on a legal foundation that may not survive appellate review.

Polymarket's Massachusetts lawsuit is a bet on that foundation. The platform is wagering that federal courts will side with the CFTC's jurisdictional claim, that the Selig Doctrine will translate into agency intervention, and that the preemption argument will ultimately prevail. The bet is informed by the same rulings that have gone against the industry. It is a reaction to those rulings. And the outcome will shape the next reaction.

The loop closes

The regulatory war over prediction markets is no longer a sequence of independent legal disputes. It is a reflexive system in which each ruling changes the strategy of every participant, and each strategy produces a new ruling that changes the next strategy.

Massachusetts won an injunction. Kalshi absorbed the loss. Polymarket observed and filed preemptively. The federal court in Boston will now rule on Polymarket's suit, aware of the state court record, the Nevada ruling, and the Selig Doctrine. That ruling will inform Connecticut's approach on February 12. Connecticut's outcome will inform how New York pursues the ORACLE Act. New York's legislative outcome will shape how platforms approach the Ninth Circuit arguments in April.

Each actor is responding to the actions of the others. Each response changes the environment for the next actor. The observation alters the observed. The price — in this case, the legal risk — is not a passive measurement of the regulatory environment. It is an active participant in shaping that environment.

Polymarket filed today because of what happened yesterday. What happens tomorrow will be shaped by today's filing. The loop has no external governor. It runs until the Supreme Court closes it — or until the industry's legal foundation collapses under the accumulated weight of adverse rulings.

Dawson Smith writes Reflexivity, a newsletter on prediction markets as reflexive systems.

dawson@monetizeopinion.com