Palin managed to meet the absurdly low expectations she faced going into the debate. But, judged by any actual objective measure, I think it's hard to deny that Biden made far more substantive points about John McCain. And that's the other key difference between the two -- Palin attacked Biden, Biden attacked McCain.
Biden realized, correctly, that he didn't have to go after Palin -- she'd indict herself. And she pretty much did, from misunderstanding the difference between personal and business taxes, to getting the name of the commander of American troops in Afghanistan wrong. Palin showed she could speak in complete sentences -- not an obvious thing before tonight -- but I don't really think she managed to make a case for voting for John McCain.