In a 5-4 ruling, the U.S. Supreme Court gave Ohio a victory Monday in a fight over the state’s method for removing people from the voter rolls, a practice that civil rights groups said discourages minority turnout.

At least a dozen other politically conservative states said they would adopt a similar practice if Ohio prevailed, as a way of keeping their voter registration lists accurate and up to date.

Prof. Rick Hasen, an election law expert at the University of California, Irvine, predicted that a win for Ohio would escalate voting wars between the political parties.