You should have seen the same thing on a smaller scale with the California recall election.
And don't even get me started on "all Terri, all the time" with the Schiavo case.
In short, don't worry about it -- people are far more likely to be abrasive and passionate on a relatively anonymous medium, such as a message board, than they are face-to-face.
For some reason, I don't think that is going to happen this time.