Sanders isn't a Democrat.  He's merely highjacking the Democratic party because he can't get on any ballot as an independent. 

Sanders admits he needs revolution to win.  Revolutionaries may have hope for him, but there will be no national revolution on the Democratic side of this election. Poor people don't have time to revolt. Only their champion/nannies have the time and money for revolution.

Sanders means what he says, but so does Cruz. Neither can get any of their sky pies baked by the legislators that they caucus with, let alone get any support from the other side.

If Sanders should by some miracle win the Democrats' nomination he will be red-baited and portrayed as Che, beret and all. Hillary can't do that to him--she needs the more rational supporters of Sanders to vote for her, unless his supporters prefer a President Trump.  

America can't survive another "President Gore--woops" situation. Trump will give a whole new meaning to the phrase "executive action."