LIEBERMAN: Bomb Iran. “I think we’ve got to be prepared to take aggressive military action against the Iranians to stop them from killing Americans in Iraq.”

UPDATE: Iranians respond with bluster. You know, if we had been firm in 1979, they wouldn’t think they could get away with these kinds of threats. If we responded firmly now, we’d get less of that in the future.

But we probably won’t, because our political culture makes a firm response to threats almost impossible. Which is why we get so many.