It does happen more and more. They are almost cult-like in their hatred. I can be in groups of 6-7 people talking (this is at work; not among friends) and I find I am the only Bush supporter.
At my job, they are mostly right leaning, my friends vary.
But having people who are so emotionaly attached, it does strike me as bizarre. I've had a friends mother question her daughter if I was an "operative", another acquience suddenly thought I might be a "insider spy".
Its scary seeing people I thought were sane, now going to weird extremes, one girl who had had a crush on me, found out I was a conservative, she flipped, and then claimed (by the way, no date ever happened) that I must have been fooling her to make her like me. She was just point blank nuts, and no, I am not in the skull and bones or any other society.
She thought all conservatives were either in secret societies, or worked for the party.