LOL!!
I love this rigging of Bush signs to combat the peaceful open minded liberals.
If someone could think of a way to rig bumper stickers, though, that would be a nice bonus.
Red pepper sticks well to bumper stickers too. Or some nasty imitation flavoring that will stick to their hands and then they touch their mouth or eyes. If they don't have enough manners to leave other people's property alone they should be punished with a little discomfort.