A new report by Common Cause, the Rutgers Law School and the Verified Voting Foundation shows Ohio and 23 other states are using voting systems for overseas and military voters that could be vulnerable to hackers. Those states let overseas voters return their ballots using the Internet, email or fax, which could fall victim to cyberattacks. The report also shows that polling places in Ohio and 15 other states use paperless machines, so there's no paper record in case of a recount.