Illinois-Southern Illinois University/Trump/Clinton Lead

[The Free North]

Sanders needs to close this gap if he wants to survive March 8th/15th. He doesn't need to win IL, but a near 20-point loss isn't going to cut it.

Well, he doesn't need to win IL specifically, but he needs to win somewhere.  A Clinton sweep of the 8th and 15th states would make the map look something like this:

At that point, it won't matter how much Sanders says the map ahead is favorable, it'll be very hard to make the race look competitive.
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That looks like game over. Mathematically Sanders is still alive, but with the momentum in Hillary's corner, what chance does he have?