Bumper stickers are so last election. Today your best bet is a window "sticker" taped to a car window that can be removed after the election. Lately it seems Trump has behaved about 11 years ago, like a drunken frat boy in the locker room. He's not the first and I'm sure he's not the last. He's crude, rude, and uncultured, but so what. the people who are most bothered are of little consequence aside from having a monopoly on the news.
So Trump is capable of acting the asshole. So what I say and others agree. Remember the contest for governor of Louisiana between Edwin Edwards and David Duke which gave the citizens of LA the choice of a convicted crooked pol and a KKK wizard. The slogan was "Vote for the Crook, it's important!" Edwards being the crook.
So here we are again with history repeating itself only on a national level. So here's the sticker: