Biden looked like an angry, bitter old man. He laughed sarcastically, mugged, guffawed, and impolitely interrupted. He pointed his finger accusingly, usually at BO's personal friend, the moderator. And come on, how many times did he say "my friend here" or refer to Ryan as his friend? He even came close to Lloyd Bentsen's "you're no Jack Kennedy" remark and we all know how well that worked. I wanted to reach through the TV screen and slap that smirk off of his face. I can't imagine that anyone that is undecided liked Biden's performance.
I have no trouble believing that he and BO didn't know that 1) the Libyan Embassy requested more security, or 2) that the CIA knew hours after the attack that it was terrorism. He threw the CIA under the bus on that question, but then said that because of the CIA they know exactly how close Iran is to an atomic weapon.
I've always thought that Biden was an unmitigated dumbass. Now I think that he's impolite, unmitigated dumbass.