I believe the exact word was "inclined" to support Rae, during an interview on CBC radio. The scenario of MP's quickly moving to one of the two camps, brought Kennedy to essentially endorse Rae.
Obviously, I disagree with Kennedy's reasoning, but for some reason his choice makes me think more of him. On a day when LeBlanc is expected to back Ignatieff, longtime Dion backer Wilfert does the same, a general sense that the powerbase is moving in one direction, Kennedy decides to buck the trend. The easy thing to do, in this situation, is follow the money so to speak. Move to the most likely successor, in selfish terms, one's "career" is best served by gravitating towards the perceived winner. The fact Kennedy decided to support Rae, tells me, that once again he is moving on principle first, political self-interest second.