What is the history in past Democratic primaries of one candidate saying that another one can't win? Specifics, please. The only generic example I can think of is when more Progressive candidates challenge more centrist rivals with lines like, "Give people a choice between a real Republican and Republican lite and they'll pick the real thing every time."

But did Edwards go around telling people Kerry couldn't win in 04? Or did either of them say that about Dean?

I know Dean used to say he was from "The Democratic Wing of the Democratic Party," but I don't recall him (or surrogates) using that as a direct attack on individual rivals. And what about past years? Did Hart say that about Mondale in '84? Did anyone say that about Jackson in '84 or '88? Did Bill Clinton say that about Tsongas or Jerry Brown in '92? Did Bradley say it about Gore in 2000?

I'm truly agnostic here. What's the precedent?