I saw a van in our area the other day with a huge homemade sign across this back window that said "F**k Bush", and in much smaller letters on the bottom left it said "cause I'm not allowed to say kill".
Haven't seen it since, but if I do I'll get the plate information.....not that'll it do any good I guess. Since we live in liberal heaven up here on the coast you see just about everything, but this was probably the worst so far.
Let the Secret Service sort it out if you see it again. Free speech is one thing, threats are another.