Via FiveThirtyEight:
If you look at a Democratic delegate tracker like this one from The New York Times, you’ll find that Hillary Clinton has a massive 394-44 delegate lead over Bernie Sanders so far, despite having been walloped by Sanders in New Hampshire and only essentially having tied him in Iowa. While Sanders does have a modest 36-32 lead among elected delegates — those that are bound to the candidates based on the results of voting in primaries and caucuses — Clinton leads 362-8 among superdelegates, who are Democratic elected officials and other party insiders allowed to support whichever candidate they like.
If you’re a Sanders supporter, you might think this seems profoundly unfair. And you’d be right: It’s profoundly unfair. Superdelegates were created in part to give Democratic party elites the opportunity to put their finger on the scale and prevent nominations like those of George McGovern in 1972 or Jimmy Carter in 1976, which displeased party insiders.
Here’s the consolation, however. Unlike elected delegates, superdelegates are unbound to any candidate even on the first ballot. They can switch whenever they like, and some of them probably will switch to Sanders if he extends his winning streak into more diverse states and eventually appears to have more of a mandate than Clinton among Democratic voters.
Clinton knows this all too well; it’s exactly what happened to her in 2008 during her loss to Barack Obama.