She'd stay in the Senate and retire in 2018 most likely. Granted that her fans won't have such a steep withdrawal curve as the 'Nistas when she doesn't run in 2016, but still rather amusing to watch. But another outcome is that Dean takes more from Edwards as the fellow populist and Hillary comes out ahead in either PV, delegates, or both, in front of Obama. Obama's momentum is killed: black voters don't see him as a viable candidate (which only happened when he won Iowa) and 55-60% of black voters stick with Clinton, who ekes out a victory in SC and romps to the nomination, picking Evan Bayh for VP.