From 8 a.m. to noon on Election Day last November, voting in Johnson County, Ind., ground to a halt.
Lines at precincts across the county, just south of Indianapolis, swelled. Some voters waited hours to cast a ballot; some left furious that they were unable to do so.
"People weren't happy. People had to leave and go to work," said Cindy Rapp, the Democratic member on Johnson County's election board.
The county votes on electronic voting machines, which don't provide a paper trail — something cybersecurity experts vehemently warn against.