Underestimating Biden?

Weigel expects the veep to exceed expectations:

Biden enters the ring underrated, and Ryan enters it as a mystery. That’s obviously good for Biden. Ryan has outmatched mostly hapless Democrats in the eight debates he has competed in for his thoroughly safe House seat. Biden has lost two presidential primaries—one gracefully, one with maximum pain and humiliation—and coasted through some debates for his U.S. Senate seat. After spending some time with the Biden tapes, I’m convinced he’s being undervalued. He has a skill that now evades Barack Obama. He comes off like he actually cares about politics and wants to keep his job.

Chait disagrees:

I think it will be brutal. Paul Ryan is just perfectly suited for this, and Biden is not. I'm predicting a massacre.