Color me skeptical about most claims of supposed election fraud, especially such "incidents" as the recent alleged ones in Nevada, where the machine somehow magically cast a vote for Harry Reid. Isn't it more likely the case that the voters or voters brushed over his name somehow and the little check mark (or whatever they have over there) then appeared? Yes it is, the same way people are constantly tapping the wrong letters on their iPhones or whatever by accident, resulting in text messages like these: "Mewt me atx 2pM thes afternone."
It's also the case that, as I have said elsewhere, a lot of voters have no idea what they are doing when they vote, especially with these newfangled machines. Frankly, they're kind of dumb about it. I'm not sure why that's such a controversial thing to say. I mean, it has been a standard joke in our world to say that people don't know how to program their VCRs (DVRs now). Why is it such a stretch to suppose that they don't know how to do this either? And, sorry, but I don't have any sympathy for it. For Christ's sake, join the rest of us in the 21st century and learn how to operate the damned voting machine.
This is what I mean when I say that most of these alleged "fraud" issues are really just user error, the election equivalent of calling tech support to find out why the computer isn't working, only to discover during the call that it isn't plugged in.
Bottom line: It's not the system's fault that you have no idea what you're doing. Figure it out. Or else stay home.