Louisiana Attorney General Liz Murrill sued Kalshi, Robinhood, Coinbase and Gemini over alleged violations of state gambling laws, while the existing case record also identifies Polymarket as a defendant. The lawsuit targets event contracts linked to sports, awards and elections and asks for an immediate temporary restraining order and injunctive relief to stop their offering in Louisiana. Kalshi responded by seeking an emergency temporary restraining order and preliminary injunction against the state. The action follows Kalshi's October 23, 2026, federal lawsuit in the Western District of Louisiana and Polymarket's separate federal litigation, both of which argue that the Commodity Exchange Act preempts state regulation. No final rulings had resolved the Louisiana cases as of November 12, 2026. The dispute follows a 2025 Louisiana Gaming Control Board advisory classifying sports event contracts as gambling and 2026 legislation expanding definitions and penalties for unauthorized gambling, amid similar enforcement actions reported in at least 12 other states.