I think there's another angle: he talked such a good talk during the Unbearable Length of an Election Cycle that he's convinced a lot of people that he's David to the current Golliath. It's too soon, he'll come around, he's just softening them up ... that kind of thing.
It's a collective trauma from the Bush years that's willing to give anyone a break because he's, you know, not-Bush.
/jordan