I've never put a sticker on my car(s), ever. Living in the Seattle area, the last thing you'd want to do is to leave a car unattended with anything remotely conservative on the car.
What I have done though is to put a Bush sticker on a piece of cardboard inside the window, then I would stash it when I park someplace. But I've never been really into stickers anyway. I've never thought that they accomplish anything.
Hey, neighbor! I just moved from Bellevue across the lake to North Dakota. >< Yea. For a girl.
Man do I miss the Puget Sound.