I've read that in 59 voting districts in Philadelphia, in 2008, not one single vote was cast for McCain. If those districts were held to the standards required by law, that's a statically impossibility. Not one republican vote? Not even by someone voting under the influence who pushes the wrong name? Not even someone unfamiliar with computers (and I'm sure most in these districts aren't) pushing the wrong name? There no way that could happen. Whoever did it in 2008, realized the error and allowed a few for Romney in 2012. Since the Russians seem to have the best hackers, maybe they'll decide who wins.
That 2008 fubar has convinced me that a all presidential elections are full of voter fraud, and voter machine hacking. To believe otherwise is to ignore the facts.