The U.S. Supreme Court on Thursday struck down a Minnesota law that prohibited voters from wearing t-shirts, hats and buttons that expressed their political views at polling sites.

The details: In a 7-2 ruling, the high court said the state’s law violated the First Amendment’s protection of free speech. The opinion added that the policy is quite broad and offered little clarity about what apparel is considered too “political” to be worn at polling stations. Still, the order allows states to craft some limits on what voters can wear when the cast their ballots.