Karl Rove, on Fox News last night, theorizing on why Barack Obama made the "you didn't build that" comment.
"Why's the president saying these things? He's saying these things, I think in part, because he's exhausted.
Look, being president is a pretty demanding job. Running for president is a pretty demanding job, and you take as much time out of the president's schedule as he has.... you have 100 fundraisers.... and you have that kind of pressure.
The political side of the White House is saying 'You've got to raise money, you've got to raise money, you've got to raise money', and then you've got the responsibilities of the president, and you're going to get tired."
Rove is more qualified than most on presidential fatigue and the demands of a White House's political wing, and there's probably some truth to what he's saying.
But most conservatives would say Obama's comments were a mistake only in the sense that they were, allegedly, a Freudian slip and, therefore, a reflection of his more leftist philosophy. And note: there's probably some study out there showing Freudian slips are highly correlated with fatigue (and alcohol).