I agree with Quin Hillyer that having Joe Biden lecturing Mitt Romney on foreign policy doesn't exactly help their cause. It would be like Obama lecturing us on the virtues of humility.
Remember, when during his debate with Sarah Palin, he said the U.S. & France had "kicked Hezbollah out of Lebanon"? Surely that was news to the people of Beirut.
On the other hand, that didn't stop them from getting elected.