Is Collins vulnerable to a conservative primary?

Ethan & Phil debate whether US Senator Susan Collins is vulnerable to a conservative primary challenger. Recent polling shows she’d only have a 3 point lead against a “more conservative challenger.” Does that mean anything? Plus, they debate the dynamics developing for the 2014 Governor’s race. Cutler makes a move toward running and Baldacci makes noise that he may very well enter. Click below to see what they have to say.