Does it exist? Yes.
Does it happen on a scale that could actually change anything? No, not as far as anyone who’s actually looked into the subject can tell, as far as I’m aware. The numbers usually work out to be, say, less than 50 confirmed cases in the last decade in my state. I mean, if they’re all colluding on the same side and all in the state’s least populated county I guess they might flip a district or something…
The fun one that you often hear is about all those dead people voting, and they’re not wrong: there are actually plenty of dead people who vote in every election. Rather than outright fraud, what pretty much always happens there is that they voted early or by mail and then happened to die before election day.
