Forget the super delegates.
Sanders is behind in the normal delegates.
If he can beat her there, the super delegates could switch to Sanders.
But Sanders needs to win 68% of the remaining delegates to come out ahead in the non-super delegate count.
Given the states are proportional, this means he has to get about 68% of the vote across the board.
That will be difficult.
I think Sanders is going to try to argue that he has the momentum and that Clinton is self destructing and would lose the general in order to sway super delegates...even though I think he will remain behind in regular delegates.