supported sanders yet act like another run for him would some crushing blow to the DNC's chances, especially before he even has the nomination. i was a reluctant supporter of his but over time i think he's put even more substance behind his candidacy. again i also don't think you can extrapolate all the demographic numbers from the primary into a general election, it's a totally different set of circumstances facing someone in your party vs the opposition, and more specifically facing clinton or trump.