
Most of all, Obama's task is to convert the white, working class voters who didn't chose him in the primary.
Obama's opponents have used charges of identitiy politics and celebrity worship to tar him. But no one is really immune.
Just as Hillary's video hit the big screen at the RiseHillaryRise rally in Denver's Cheesman Park, big raindrops started to fall.
It was a fitting metaphor.
There are dangers in the Biden selection. It is, first of all, a defensive choice.