I think you could see him thinking. What I mean is that when he got asked a question he should have known the answer to as a matter of character or values he had to run through his mental database for the answer. On abortion, on religion, on affirmative action you could tell that he was calculating the best political answer rather than his heartfelt answer.
On policy questions he usually didn’t miss a beat. But on values questions he really seemed like he didn’t know what to say about where his own gut and heart are. I think that sort of thing hurts him a lot with people who are still trying to judge the man, not the policies.