My understanding is that Hillary was strong in both her female and elderly demographics – stronger than Obama. While I don’t really care who he picks as a running mate, and I do understand that he would loose some folks either way (although I am not convinced that anyone knows enough about the composition of the ‘swing’ voters to judge that accurately, and pissing off part of your core – female Dems – just seems like a stupid risk), I think Hillary was a stronger candidate and partner that Biden will be. To be blunt, I think Clinton may have been passed over because she was unlikely to be a ‘quite’ VP and may have overshadowed her Pres more than would have been comfortable.