I would think that most pundits would say that VIce President Biden won, with the caveat, he might have won the battle, but lost the war.
As I review the debate, what personally comes to mind is how would everyone respond if Mitt Romney had a similar debate with President Obama and did a "Biden" on the President?
Next, the Vice President is a heart beat away from being President. What I saw didn't show Presidential material. I can just imagine "President" BIden sitting down with say, Vladimir Putin, discussing their differences and acting the same way with Putin as he did Ryan.
Condescending arrogannce is not an impressive trait in any individual. I would have rather had the Vice President, speak from the standpoint of "wisdom", of a seasoned political veteran, rather than denegrating smiles and smirks.
Due to the Vice President's age, I thought he would be more warm, addressing the issues, speaking on behalf of the democratic party in a respectable manner, as he did in his debate with Sarah Palin.
Perhaps his demeanor was due to President Obama's less than stellar performance in the first debate and he needed to come out with guns blazing to show that they (democratic ticket) means business and aren't going to be so easily shoved around.
Whatever the case, those who have already "chosen" their candidate were either pleased, or not pleased with their respective candidate's performance. Those who are still undecided, may opt for the Republican ticket, rather than the Democrat due to Vice President Biden's performance. That's called losing the war.