I'm not sure Barack Obama has won the nomination so much as Hillary Clinton has lost it. Reportedly, prominent folks in her campaign are dickering to write books about it, which is being taken as a sign that they know it's over. I may even buy one of those books as I have a certain curiosity to know how such savvy politicos as the Clintons managed to take an inevitable win and turn it into a "bad loser" loss.
A lot of folks seem to think she's staying in because she wants to be offered the vice-president slot. I don't know if she does and I don't know if Obama would be nuts to offer it. It might be a "unity ticket" but it also might be two strong forces uniting to keep working against one another. My guess is we won't find out.