How to respond to an old person who has just been racist.

Old man: Guess which candidate I'm following, just a little bit.
Bus driver: Senator Clinton.
Old man: Don't insult my intelligence.
Bus driver: Giuliani.
Old man: Don't insult my integrity.
Bus driver: Obama.
Old man: Yes! I'm following Obama. Just a little bit. Do you happen know why?
Bus driver: No I don't, sir.
Old man: Well, there's two reasons. First, he's an educated man. I can respect that.
Bus driver: Sure enough.
Old man: And secondly, he's a well-groomed man. That's very important in a candidate. You get it?
Bus driver: I got it.
Old man: But that's why his people are angry at him.
Bus driver: Oh? I didn't --
Old man: That's why he's got to have body guards around him all the time. Because his people are jealous. Because he's so well-groomed.
Bus driver: Huh. Yes sir.
Old man: You got it.
Bus driver: Say, whatever happened to Ross Perot? Haven't heard from him in a while.
Old man: No, can't say I've heard from Ross Perot.
In the rear view mirror, bus driver exchanges a sly smile with me.