I do my part to remind the owners of vehicles with Kerry stickers that they should remove em; I point, yell loser, and start laughing. Then I receive an elbow in the side from my wife and an admonishment to be nice.
My teenage son gives a four finger wave as he chants 4 more years whenever he sees a Kerry Edwards sticker. He always does it with great glee and a big grin. Recently he received a one finger wave, not of the thumb's up variety, in return from someone who also sported a great big grin. lol
My son blushed beet red and I just said "See. I have told you NOT to do that." I do worry about road rage when he does it.
My car wasn attacked in a parking lot by some liberal looie toon before the election and it scared me. Not enough to remove my sticker though. :)