Amusing. Though, I'd rather knock off anyone with any sort of political bullshit on their vehicle, and add back as necessary, being a bit more careful this time...
Car based discrimination.
Maybe not allow foreign car owners. Or people with RED cars, they may be dangerous. Or people with high mpg cars, they may be of a certain political persuasion. Or people with low mpg cars, they may be wasteful with office supplies. Or people with fart cans..... OK, THAT IS A GOOD IDEA.