Sanders seems to have absolutely no interest in being the leader of the Democratic party. He mocks Clinton for fundraising big-ticket donors, but she is working for Democrats at every level across the country. He claims to want a political revolution, but doesn't seem to be willing to work to get any other Dems elected. That's the reason the superdelegates don't support him, and they never will.
"It does me no injury for my neighbour to say there are 20 gods or no god. It neither picks my pocket, nor breaks my leg."
-- Thomas Jefferson