The Chretien/Martin feud traumatized some Liberals so severely that they think it's happening again. It isn't.
A feud of Chretien/Martin proportions is an unusual thing. Martin just couldn't accept that Chretien won the leadership. As finance minister he tried to control all the other departments, and he openly campaigned for Chretien's job for years. Chretien, scrappy and stubborn as ever, stayed in power after he should have left in the hopes of leaving Martin too old to reach his goal. Or at least that's what seemed to be happening.
The Liberal party still has rivals, in particular Dion, Ignatieff and Rae, but none of them have exhibited any feuding behavior. Ignatieff and Rae have been consistently loyal to Dion (especially Rae). They didn't take advantage of his faltering in the polls in any way. They were responsible party members, praising and supporting their leader. And despite some unconfirmed reports during the last leadership race, Rae and Ignatieff remain BFFs. They talk on the phone every day. They may decide they want to run for the same job again, but there's no animosity.
Now that there's another leadership race on the horizon, I think we can all calm down about the so-called infighting. It just ain't there. Who knows, all the allegations of it might be from Tory trolls, as a recent commenter on my site suggested.