The only reason Bernie is losing is because the fix was in for Hillary before a vote was even cast. She locked up just about all of the Super Delegates, which is why she is winning. If this were a straight up race like the GOP has Bernie would probably be winning.
Hillary has received the most
actual votes of any candidate, on either side, in this primary season. And it's not even close. Even if you completely exclude superdelegates, her delegate lead over Bernie is over twice as big as Trump's delegate lead over Cruz.
Everyone complained about superdelegates in 2008 too, when they were all lined up behind Hillary at the start. But once Obama started beating her in the actual primaries, they jumped over to him. Superdelegates are a non-issue.
Florida and Ohio will be interesting and will probably decide it. They are "winner take all".
Democrats do not do "winner takes all" in their primaries, which is why Hillary's already-huge lead is really even bigger than it looks. All Dem primaries/caucuses are proportional, which means that Bernie cannot simply win states 52-48 like he did with Michigan last night; he will have to start winning
large states 80-20 to catch up in delegates. That is highly unlikely, to put it mildly.