I almost fell on the floor listening to this guy. There used to be some kind of rule for excluding marginal candidates from these debates, and the organizing committees should have invoked it for Ron Paul years ago. What a disgrace: See Sacremento Bee, "Paul and Santorum clash over US-Iran relationship."
Anyway, a big write up at NYT, "8 From G.O.P. Trade Attacks at Iowa Debate."