In this Nov. 8, 2016, file photo a lone voter fills out a ballot alongside a row of empty booths at a polling station in the Terrace Park Community Building on Election Day in Cincinnati. An expert panel of the National Academy of Sciences called for fundamental reforms to ensure the integrity of the U.S. election system. The report calls for replacing rickety voting machines with more-secure voting systems that use paper ballots or equivalents, and other measures such as a particular form of postelection audit aimed at spotting fraud. (AP Photo/John Minchillo, File)
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