> Even to fraudulently elect a town dog catcher, you would need hundreds of people to fill out fraudulent ballots, one by one by one. Where are you going to get those people from? Why would they spend their time doing that? What's in it for them? What incentive would that have to keep it a secret?

What if someone (perhaps a political campaign or party) with some kind of vested interest and a whole lot of money broke off a couple hundred dollars for a few hundred people?

Seems like there's money and possibly NDAs involved, in that scenario.

What if someone (perhaps a political party member) with some kind of ends-justify-the-means mentality thinks its for the greater good if they go around voting fraudulently? What if that person convinces a few other like-partied folks that it's for the best and they go along with it?

There's certainly many possible scenarios for people committing some form of election fraud.