Hillary Clinton

His goal, unless he's a moron, isn't to destroy the Democratic Party, but to change it. If he doesn't endorse Hillary people will say he was never a democrat, was just lying all along, and it makes him less relevant as he'll be seen once again as one of those people in a smaller party like Nader that can never win. I think his strategy now is to leave as much of a mark on the dem party as possible by pulling it further left (except on guns) and this will be his legacy. That's how I think he sees it, and people behind the scenes have been confirming this for the most part.

Now if he is dumb, he'll hit the nuke button by refusing to endorse, split the party and help Republicans win in the process. But considering he realized during Kerry's run the folly of voting for Nader and told people not to vote for Nader, I think he's not dumb and his strategy since NY hasn't been to win, but to impact the party in a lasting way by reminding it to continue moving the center further left. And THAT has been the Hillary argument all along - move further left but in a quieter, effective, but less drastic way (and with a well thought out plan that can actually pass through congress) as that's the only way possible in America. You don't dictate to the millions of righties and centrists. You work with them to get what you want over time. Hell it took 55 years after black people got the right to vote to give women the right. Like it or not, that's America.