In a suit filed in federal court, the ACLU claimed that more than 35,000 potential voters were blocked over two years from voting because of the additional hurdle - or nearly 14 percent of all new registrants.
The Kansas law requiring documents like a birth certificate or U.S. passport for voter registration, which took effect Jan. 1, 2013, is one of numerous voter ID laws passed by Republican-led state legislatures in recent years. The ACLU alleges that Kansas goes beyond what is required by federal law.