I'm more of a "supporter" bumper sticker person over a "wacky" one.
My stickers are a Red Wings logo in the upper left corner of my back window, a Wigan Athletic sticker on the lower left side, a JohnnyCashRadio.com in the lower right and a local brewery in the upper right. My old college radio station is in the passenger window behind the driver's side and a "I support the local zoo" sticker on the other side.
I also had a Gary Johnson for President sticker, but I never stuck it to anything and it just sat in my dashboard.
I think political stickers on the backs of cars are kinda lame.
"Oh, you voted for that guy and are sticking with him regardless of win or loss. Yippie skippy."