It wasn't supposed to be this way. After the disputed 2000 presidential recount, Congress provided more than $3 billion to replace punch card and lever-operated machines. State officials across the country said the new systems would eliminate human error and political tampering.
But problems with the machines soon followed: vanishing votes, breakdowns, malfunctions and increasing evidence that the devices were vulnerable to hackers.
Of course, the card scanners are also open to fraud.