I think it is pretty obvious at this point, Sanders gets it, unless the rules are changed in the 11th hour to allow super delegates to vote in the first round.
I was listening to Ben Shapiro today, and say what you will about him being too brash, I think he hit the nail on the head as to why. The Dems, over the last 10 years, have been building on intersectional politics and the idea that America is inherently prejudice to many different types of people, which is what Sanders is running on. We are now at the point where this argument has been played out in its entirety and the (unintended) logical conclusion is that the country is evil and needs to be fundamentally changed in every aspect. Listen to any Bernie supporter or look at Bernie's plans, this is what his campaign is about.
Now saying otherwise pretty much destroys intersectional politics, which means no one in the party can say this, and that is why no one can beat him in the primary.
The Dems have put themselves in a place where they can not use their best case against Sanders, that being that America is a great country, perhaps in need of some improvements but still one of the greatest causes of good in the history of the world and does not need to be fundamentally changed (which is what most Americans believe).
Biden cant say this without being destroyed by the press.
However Trump can, and that is why Sanders will pull the entire Democratic party down with him when he wins.
