Tens of thousands of military and overseas Americans casting ballots online this fall face a high risk of being hacked, threatening to cause chaos around Election Day if their votes get manipulated or they transmit viruses to state and local election offices. More than 30 states — including battlegrounds such as Colorado, Florida, Iowa, Nevada and North Carolina — allow various methods of online voting for citizens living outside the U.S. While state officials insist their ballots will be counted without any serious problems, ample warnings are nonetheless being sounded from the left, right and even inside the federal government that internet votes can’t be securely transmitted in today’s everything-is-hackable environment. “It’s not something you would do with your Social Security number. You shouldn’t do it with your ballot,” warned Susannah Goodman, director of voting integrity at Common Cause. It’s a point of pride for many states that Americans abroad and overseas troops can even cast a ballot online using the latest in technology, giving these voters a say on their next commander in chief even if they’re stationed in a remote or even hostile location, like Afghanistan or Iraq.