As for your being convinced that they vote in elections from their campus residence addresses and then vote again in their home districts, or even by absentee ballot in their home states -- based on what I've heard the little numbskulls say when they think they're safely amongst like-minded people, you can be pretty confident that this does happen. Often.
Republicans have to work twice as hard because Democrats vote twice as often.
Sorry for the double-tap.
Additionally, today was the first day to request absentee ballots, and there's been a run on the city clerks' offices. Some of us suspect there are a LOT of students planning to vote from wherever they live.