From Tucson Sheriff Clarence Dupnik’s press conference on the Giffords shooting:

Dupnik: Let me say one thing, because people tend to poo-poo this business about all the vitriol that we hear inflaming the American public by people who make a living off doing that.  That may be free speech.  But it’s not without consequences.

Reporter: How do you know that that’s what caused it?

Dupnik: You don’t.