There is a well embedded meme that the way for the Democrats to win is to go back to "Black and white unite and fight" - that is appeal to working class solidarity. That hasn't worked out so well in the past. And it's even harder with increased atomization of the workforce and deeply embedded clashing universes of discourse.
There are many divides in the country besides race - religion, gender, class, etc. I think it is plain that the driving force in the election of Trump was race. He did put it at the center of his campaign from the first moment, didn't he? Therefore I conclude that the Sanders campaign is wrong: economic appeals will not overcome the deep divides. It's going to take more fine grained appeals than that - to recover those white Obama voters who turned to Trump in 2016, - gwc
More Thoughts on the Intra-Democratic Divide – Talking Points Memo
by Josh Marshall