FILE - In this March 18, 2014 file photo, voters cast their ballots in the Illinois primary in Hinsdale, Ill. A federal judge has scaled back Election Day voter registration for highly populated areas in Illinois, a decision that sides with Republicans who claimed in a lawsuit that last year's extension of same-day registration is unconstitutional. Judge Samuel Der-Yeghiayan's move on Tuesday, Sept. 27, 2016, temporarily blocks wider same-day registration lawmakers put into effect in 2015. (AP Photo/M. Spencer Green, File)

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