I did some digging on Fred's damaged window story about the State College Democratic campaign office, and it seems that it did occur, although the articles don't make it sound like it was done with a weapon, which probably explains why it wasn't national news. I would guess, based on the description in the release, that it was some local frat boys, given that the getaway car was a white Tempo - not at all typical of your average Republican activist.
In so far as it's an incident of violence against a campaign office, I have to denounce the act, by whomsoever it was. I can't imagine that the police won't find them - there aren't that many white Tempos in the area. I don't think I've ever seen one, come to think of it.