but I find it hard to believe he didn't take the debate seriosuly.
Same. I think the combination of Romney staring him down literally the entire time, regardless of which one of them was talking, and essentially being called a liar to his face was not something he was comfortable with. I don't think he is necessarily a stupid man, but I don't think he has the gift of being able to recall massive amounts of detailed factual information and form it into arguments. That's fine if all you are doing is regurgitating the talking points your advisors are feeding to you, but if someone is flat out accusing you of inventing facts you have to be able to come back at him with something more than those talking points. I'm not sure Obama is capable of that.