Would it bring the women’s vote or would they be furious it isn’t Hillary?
Obama needs every woman and Hillary vote he can get. It's his biggest vulnerability, among those likely to vote.
The independents are less important. If they haven't made up their mind by now, they are not likely get on board. So the strategy is to make McCain look so bad, that the undecideds stay home.
Good campaigners only want their supporters to vote. If ya can't convince then, confuse them, keep 'em home.