Here in the US there is this long-standing tradition of bumper stickers, that is, stickers you put in the back of your car to declare your opinions on something, politics, religion, or whatever. Here's an example:
Here, the owner of the car declares that he can't wait till January 20th, 2009, the last day of Bush in office. But this other one I think is fantastic:
If you are one of the four people in the world who still don't know, Voldemort is the ultimate evil guy in the Harry Potter books. So, first this sticker causes a smile, since it is using this fictional character in a political context. But the real message is that if Voldemort were real, he'd be a Republican, and this kind of means that all Republicans are evil. Can't do a much better job in just three words.