None of the post March 15 states are terrible for Bernie, including the lone former confederate state.
None of them? Well surely that's not true. What about Maryland? It's 61% white and 30% black, in comparison to 60% white and 31% black in Georgia. It's also less white then Louisiana (64% white) or Alabama (69% white.)
Well besides that non-Southern Whites (obv excluding MD here) are
significantly less Democratic, as Smash said, Maryland is also only 52.6% non-Hispanic White, per 2014 census updated projections. However, because of how much more Democratic the Whites are in MD, they will be a bigger force in the primary.
He's not going to win that state or narrow the gap IMO. I'd say 60%+ Clinton, at least. It just won't be an Alabama-style blowout.