No incumbent or candidate who thought they were on a path to winning would have behaved like that last night. Surprisingly he looked really desperate last night and it was on a FP debate when much of the countries minds are on the economy. Awhile back he made the decision to make his re-election about Mitt, most importantly if Mitt is electable, instead of his own policies the past 4 years.
IMHO, in the eyes of America, Mitt has passed the litmus test, both domestically and in FP, at the same time re-enforcing to America why they have been so miserable for the past 4 years. Axe, Bam and Co haven't been able to have a coherent retort and have demeaned themselves and the presidency to the level of a city council debate. Bam is stuck with school child speeches about big bird, binders and Romnesia while doing to damage to the main message of Mittens.
This is not the behavior of a candidate who thinks he is going to have a chance and reeks of desperation.