FILE – In this March 15, 2016, file photo, a primary election voter casts a provisional ballot at

FILE – In this March 15, 2016, file photo, a primary election voter casts a provisional ballot at a polling place in Westerville, Ohio. In Ohio, one of the biggest prizes in the 2016 presidential election, groups have challenged shortened early voting, procedures for absentee and provisional ballots and the process for purging voters from registration rolls, potentially affecting when voters can cast ballots and how ballots are counted. (AP Photo/Matt Rourke, File)
Matt Rourke / AP
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