It's almost impossible for Bernie to win at this point.
From here on out, he'd have to win 54% of the remaining delegates to have a chance (
Not an average victory of 54% to 46%, but be awarded 54% of the remaining pledged delegates). More than half of those remaining delegates lay with California, New York, Florida, Pennsylvania, Illinois, and Ohio.
If he ends up splitting the delegates of those states evenly, he'd need 58% of the remaining delegates outside of those states to compensate. If he loses any of those six states to a moderate/significant extent, then he'd likely have to win 60+% of the remaining states outside of those six. He's expected to lose big in North Carolina and Florida tomorrow, so that 60+% is likely going to be the case. He has a chance to pull out upsets in Ohio, Illinois and Missouri - but he can't really afford to evenly split the delegates which is likely what he'd do if he pulled an upset. And New York is Clinton's backyard, and only 44% white (and 33% non-Hispanic white) - so he's likely to lose big there.
Is he going to win New Jersey, New Mexico, Arizona or Maryland? Probably not. Even California is a stretch.
He can potentially run up the delegates in states with white majorities, where he's had success in the past, but as
Vox states - the contests he did well in previously were within New England (his backyard) or Midwestern Caucus States. Will he be able to do the same in these remaining white heavy states, which are Midwestern primary states (Ohio, Indiana, Wisconsin), Western states (Oregon, Utah, Idaho), or Appalachian states (Kentucky, West Virginia) - and are these victories going to be landslides to counteract what Hilary was able to do in the Southern states?
Having said all that, yeah - it's technically possible for him to close Hilary's lead... but that's only a statistical possibility. Not really a real world one.