Illinois Uses Iowa Kalshi Ruling to Fight Prediction Market Injunction

The legal fight over sports event contracts has moved from one federal courtroom to another.

On September 8, 2026, a federal judge in Iowa rejected KalshiEX LLC's request for a preliminary injunction that would have prevented Iowa officials from enforcing state law against sports event contracts.

Illinois quickly moved to put that decision before another federal court.

In a filing dated September 8, 2026, the Illinois Attorney General's Office asked the court for permission to cite Judge Stephen H. Locher's Iowa decision as supplemental authority in the Illinois case.

The timing matters.

Illinois is already dealing with pending preliminary injunction motions brought by Kalshi, Coinbase and the Commodity Futures Trading Commission (CFTC). The Iowa ruling addresses some of the same legal questions now before the Illinois court.

That gives Illinois an opportunity to point to a fresh federal decision supporting its position while its own case remains unresolved.

What Illinois Filed on September 8

The document is titled “Defendants' Motion for Leave to Cite Supplemental Authority.”

In it, the defendants ask the court to consider Judge Locher's decision in KalshiEX LLC v. Bird, a case in the U.S. District Court for the Southern District of Iowa.

The Iowa decision was issued on September 8, 2026, the same day Illinois filed its motion.

Illinois describes the Iowa ruling as a decision denying Kalshi's motion for a preliminary injunction against Iowa officials.

The Illinois filing then highlights two conclusions reached by Judge Locher.

First, the judge held that sports event contracts are likely not swaps under the Commodity Exchange Act.

Second, the judge held that Iowa state law is likely not field or conflict preempted by the Commodity Exchange Act.

Those two questions are central to the broader dispute over who has authority over sports event contracts.

Are these products federally regulated financial contracts?

Or can states apply their own laws when they believe those contracts function as sports wagering?

The Illinois case presents similar questions.

Why the Iowa Decision Matters in Illinois

Illinois is not claiming that the Iowa ruling automatically determines the outcome of its case.

Instead, the state is asking the court to consider it as supplemental authority.

That distinction is important.

A decision from another federal district court does not automatically settle a separate case. However, a recent ruling addressing the same legal questions can give a judge another federal court's reasoning to consider.

That is exactly what Illinois is trying to accomplish.

The filing says the same questions addressed by Judge Locher are presented in the pending preliminary injunction motions in Illinois.

The state therefore argues that the Iowa decision may be helpful to the court when considering those legal issues.

For Illinois, the value of the decision is not simply that Kalshi lost a motion.

It is that the Iowa court reached conclusions on the specific federal-versus-state regulatory questions that are also being contested in Illinois.

Kalshi, Coinbase and the CFTC Are Still Seeking an Injunction

The Illinois case remains active.

According to the September 8 filing, preliminary injunction motions are still pending from Kalshi, Coinbase and the CFTC.

That means the Illinois court has not yet resolved those motions.

The new filing is an attempt by Illinois to strengthen its position before the court rules.

A preliminary injunction can have major consequences during litigation because it can restrict a party's actions while the underlying case continues.

That makes the legal reasoning surrounding these motions especially important for prediction-market companies.

Illinois is now telling its court that another federal judge has considered similar arguments and reached conclusions favorable to the state's position.

The Key Legal Question Is Federal Preemption

At the center of the Iowa ruling is the relationship between federal commodities law and state law.

The highlighted section of the Illinois filing points directly to Judge Locher's conclusion that sports event contracts are likely not swaps under the Commodity Exchange Act.

It also points to his conclusion that state law is likely not field or conflict preempted by that federal law.

In simple terms, the dispute involves whether federal regulation prevents states from enforcing their own laws against these types of contracts.

Kalshi and other parties challenging state action have argued for federal authority over the contracts.

States involved in these disputes have taken the opposite position, arguing that their laws can still apply.

The Iowa decision gives Illinois another federal court opinion supporting that second position.

Why the Timing Is Significant

Illinois did not wait weeks or months before bringing the Iowa ruling to the court's attention.

Judge Locher issued his decision on September 8, 2026.

Illinois filed its motion on September 8, 2026.

That same-day filing shows how quickly developments in the prediction-market litigation are now affecting cases in other states.

The cases are no longer operating in isolation.

A decision involving Kalshi in one state can immediately become relevant in another state's court when the underlying legal arguments overlap.

That could become increasingly important as more states challenge the treatment of sports event contracts.

The Iowa Case Could Become Part of the Illinois Court's Analysis

The Illinois filing specifically describes the Iowa ruling as potentially helpful to the court on the relevant points of law.

That does not mean the Illinois judge must follow it.

The court will still have to consider the arguments and record in the Illinois case.

However, the ruling gives Illinois a recent federal decision that it can cite when responding to the arguments made by Kalshi, Coinbase and the CFTC.

That is the immediate significance of the filing.

The Iowa decision has moved beyond the Iowa courtroom and is now being presented as part of the legal argument in Illinois.

What Happens Next in the Illinois Case?

The next major question is how the Illinois court will handle the pending preliminary injunction motions.

Illinois has now placed the September 8 Iowa ruling before the court and explained why it believes the decision is relevant.

The court will have to consider that argument alongside the positions of Kalshi, Coinbase and the CFTC.

The outcome could matter beyond Illinois.

The prediction-market industry is facing a broader question over whether sports event contracts should be treated primarily as federally regulated financial products or as products that states can regulate under their own sports wagering and gambling laws.

The Iowa ruling gives states challenging these contracts another piece of federal court reasoning to point to.

Illinois is now doing exactly that.

Bottom Line

The important development is not that Illinois has won its case.

It has not.

The important development is that Illinois has quickly brought the September 8 Iowa Kalshi decision into its own pending litigation.

Judge Stephen Locher's Iowa ruling found that sports event contracts are likely not swaps under the Commodity Exchange Act and that state law is likely not preempted by that federal statute.

Illinois says those same legal questions are before its court.

For now, the Illinois Attorney General is asking the court to consider the Iowa ruling as supplemental authority while it weighs the pending preliminary injunction motions involving Kalshi, Coinbase and the CFTC.

The broader fight over who gets to regulate sports event contracts is therefore becoming a battle fought across multiple federal courts, with each new ruling potentially becoming ammunition in the next case.