When you see this on the back of my car, whether a newly polished SUV or a pile of rust driving down the street, you know that I am a patriotic conservative American.
Lots of dumb liberals have American flags on their bumpers. The difference is they all have liberal bumper stickers right next to them-- in order to avoid confusion that they could actually love this country without any strings attached. "I love America--- BUT IT'S OK, I love Howard Dean too!"
A solitary American flag is virtually a campaign ad for Bush. No "BUSH/CHENEY" sticker is needed to go along with it, as that would be redundant.
Sometimes a liberal driver will display the flag with a long-winded bumber sticker, one of those that's too small to read while you're driving. But when you get up close and start reading it, you start laughing your ass off at some dumb, bitter line like "If only we had less bombs and more books, yadda yadda...."
The point is you will never see a liberal with the flag alone on his or her car. Not unless it's upside-down, or covered with a hemp plant, or a peace symbol, or some left-wing political statement. The flag for the flag's sake with no other message is simply offensive to them.
No wonder why that is..... because it's MINE.