Biden's laughing turned off a lot of people. I get that the idea was to be dismissive of Ryan, but when Ryan is talking about people dying in Libya, and Biden is laughing on a split screen, it comes across as detached.
I don't think this debate changes anybody's opinion, other than Ryan came across as perhaps a bit too passive, and Biden came across as a bit of a bully who even pointed his finger at the moderator a few times.
Maxiep has it right, I think. Biden was loud, rude, a bit aloof, and arrogant, and that works to fire up his base. Ryan seemed a bit too unemotional and wonkish.
The big lie in this debate, though, was Biden saying nobody in the State Department claimed it was terrorism. That directly belies yesterday's testimony in the House by senior State staffers. Romney needs to corner Obama on this obvious lie in the foreign policy debate.