“I tried to cast a vote for myself and instead it cast the vote for my opponent,” Moynihan said. “You could imagine my surprise as the same thing happened with a number of races when I tried to vote for a Republican and the machine registered a vote for a Democrat.”
The people who program the machines purposefully put the two a mile or so apart, so that calibration errors of the touch screen won't do this. So in order for this to happen, you'd either need the most incompetent person in the world doing the calibrating...
...or you'd need a completely crooked person.
Since this is Illinois, I'm going for the second category.