Men in particular - white men - don't like a wimp. Hiding behind women's skirts is NOT guaranteed to win Obama white men's votes, which was the whole point of the Biden pick. No man likes a guy who can't stand up for himself. And without male votes, Obama will lose this election. Women are also turned off by an insecure man.
"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." - Manuel II Palelologus