Bernie Sanders insists he can still win. The math says otherwise.
The math doesnt work for him. If you give Sanders all of the super-delegates in all of the states he has won so far, the total is around 150. If you give Clinton all of the super-delegates in all the states she won, the total is around 375. If, for good measure, you were to also give Sanders all of the super-delegates in Indiana and in California (both of which Sanders says he has a good chance at winning), Sanders would still be around 100 super-delegates behind Clinton. That would not help Sanders close the gap among pledged delegates, obviously.
Even some of the liberal groups backing Sanders have said calling on the super-delegates to flip the outcome is a non-starter. And its very hard to imagine Sanders seriously continuing with this argument, given that he has been asserting for months that the Dem establishment is rigging the process on Clintons behalf. But Sanders theoretically could push this all the way to the convention, by refusing to concede, even after the voting concluded and Clinton still held a lead in all the key metrics.
Josh Putnam, an expert in party rules and political science lecturer at the University of Georgia, says that if Sanders really did this, it would force a formal roll call vote by delegates during the convention proceedings. It would not go his way, Putnam tells me. He might be able to peel a few super-delegates off here and there. But the vast majority would continue to stay with Clinton.
https://www.washingtonpost.com/blogs/plum-line/wp/2016/05/02/bernie-sanders-insists-he-can-still-win-the-math-says-otherwise/