Hardest part for Sanders is that Clinton already has some ~400 superdelegates pledged to her. Those "pledges" can change at the convention, I think, but aside f

Hardest part for Sanders is that Clinton already has some ~400 superdelegates pledged to her. Those "pledges" can change at the convention, I think, but aside from that, Sanders really needs to win by a very wide margin to overcome the heavy handicap. It would probably hurt the Dems significantly in the general election if Clinton acquires the nomination by party-insider superdelegates, circumventing a large popular vote in favor of Sanders. There is considerable truth to Sanders arguments that he'll draw a much larger voter turnout for the general election, even if a portion of those come to vote against him.