This is interesting, though it probably says more about Richardson than it does about Obama.
"I had just been asked a question — I don't remember which one — and Obama was sitting right next to me. Then the moderator went across the room, I think to Chris Dodd, so I thought I was home free for a while. I wasn't going to listen to the next question. I was about to say something to Obama when the moderator turned to me and said, 'So, Gov. Richardson, what do you think of that?' But I wasn't paying any attention!
I was about to say, 'Could you repeat the question? I wasn't listening.' But I wasn't about to say I wasn't listening. I looked at Obama. I was just horrified. And Obama whispered, 'Katrina. Katrina.' The question was on Katrina! So I said, 'On Katrina, my policy...' Obama could have just thrown me under the bus. So I said, 'Obama, that was good of you to do that.'"