Just so everyone knows, I think it exists. It exists in all parties, when the supposed "front-runner" of a leadership battle who tends to be the opposite of what the old leader or a significant portion of the party was/wants gains an anti-movement.
To put it into easy perspective, it's happening right now in the US. The focus on the GOP leadership race is who will be the "anti-Romney," or if the polls keep going as they are, the "anti-Perry." That's just how it is.
I expect there will be an "anti-Rae" candidate, if the man was running in the Liberal leadership race. There was an "anti-Iggy" movement, after all. Same with Chretien, Harper, Clark, etc. There's an anti- someone out there for the front runners.
And I definitely believe Thomas Mulcair is the current front runner in the NDP, don't you? He's a deputy leader, you can just tell he has leadership ambitions, and he represents and practically birthed the current NDP Quebec caucus, which I might add makes up well over 50% of the caucus, but likely represents barely 30% of NDP members. That right there makes it even more interesting - the fact that the NDP membership, mostly left-leaning ROC anglophones, need their own candidate against the francophone Quebecois who's just a little bit to the right of the party.
It's a perfect storm for an anti-Mulcair. Just you wait. I can even picture who it is.