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Polling station chairman helps a voter at a voting machine during the Republican presidential primary in February in West Columbia, S.C. Sean Rayford/Getty Images hide caption

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Sean Rayford/Getty Images

After DNC Hack, Cybersecurity Experts Worry About Old Machines, Vote Tampering

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Voters stand in line as they prepare to cast their votes in Hialeah, Fla., on Tuesday. Alan Diaz/AP hide caption

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Alan Diaz/AP

A government cybersecurity expert warns against new moves by state election officials to accept online overseas ballots, like those from deployed U.S. troops. Rafiq Maqbool/AP hide caption

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Rafiq Maqbool/AP