My favorite line from the Presidential debate last night was from McCain (from the CNN transcript):

"The Iranians have a lousy government, so therefore their economy is lousy."

I'm sure Obama noted the irony (he's far too smart not to), but I suspect he thought it would be a bad tactic to point out that McCain had just described the current state of the United States. (Tactic, not strategy, and Obama knows the difference, I'm sure.)