Even if it is basically a donation page, I think with the "she can only win if she cheats" narrative he's been building, it plants the seed in his supporters' minds that they can personally do something to make sure that doesn't happen.
I feel like we're going to see a lot of cell phone footage on election day of guys standing around with AR15s the minimum distance required by law at urban precincts. PA has de-facto open carry, and even though it has laws on the books for "cities of the first class" (basically Philadelphia), if you're licensed to carry it's technically not illegal (though the state's site warns it "will draw unwanted attention from law enforcement").
I also wouldn't be surprised if there's reports of gunfire near polling places early in the day to scare people. If you're a head-fucked white dude who's spent the last 8 years being oppressed by the Founder of ISIS and the Butcher of Benghazi, firing off a few rounds in the air is probably the least you're willing to do to Make America Great Again.
Well now you're just being nuts.
I've heard of ACORN stealing the election, but this is ridiculous.
Trump walnut be beaten, and if you try, he'll cashew red handed.
Deez Nuts to be elected in a landslide.