Most of the time, of course, veep nominations have less upside than downside potential. But it's worth wondering whether the response would have been so anemic to the selection of Hillary Clinton.
What's more, although the Biden pick was aimed at remediating Barack's weaknesses with regular voters, it also spoke volumes about the candidate's confidence in himself and his own charm when it comes to winning back Hillary's supporters. Apparently, he feels that his base (and hers) has nowhere else to go, and he's willing to gamble that Hillary's appeal was more demographic (or ideological) than personal.
He could be right; I guess we'll see.