At least one expert is hoping for problems with the electronic voting machines many states bought following 2000's disputed presidential vote.
Avi Rubin, a computer science professor at Baltimore's Johns Hopkins University, says if the vote goes smoothly, he's worried more states will buy the machines. Rubin says without a paper trail, the machines are not safe and that they have no capacity for a recount.
He believes states moved way too quickly in adopting e-voting. He says the machines have never been tested on a large scale and the potential for counting mischief is unacceptably high.