Dan Carlin has a podcast called Common Sense (its worth the listen) and he was recently talking about the role of super delegates during the party conventions.
They have roughly 25% of the vote and are not beholden to a candidate like delegates from the states. Normally they vote the line the other 75% have established but Carlin was talking about how their true role is to keep the party from getting hijacked by a swell of new voters or a candidate new to the part, which Bernie basically is.
Hillary is a party stalwart where Bernie is a social democrat using the Democratic Party apparatus to get elected. If the primaries are close, you could see the party "rescuing" itself from this outsider with those 25% of delegates that represent the Democratic party.
The GOP is even more convoluted because Trump might run as an independent if the party defeats him in the primaries, a move Bernie has said he won't do.
Something to consider if you are wagering on this bizarre race.