Then again, as you said, the ACLU would almost certainly defend all the people you're talking about, and they're rather well known for leaning to the left.

EDIT: It's worth noting that I don't know of any liberals who would actively campaign for the expulsion of a student protesting abortion. That whole "defend to the death your right to say it" thing is pretty strong on the left, along with the "and then I'll accuse you of being bigoted for disagreeing with me" that's sometimes tacked on to the end.