Bernieism is the exact reason they're failing (shh, don't tell them, I wanna see 'em fail).
Well, he would help them in the rust belt while getting them killed in the wealthy suburbs that Hillary tried so hard for. He would do better among northern working class whites while doing badly among southern working class whites and higher income college educated whites in general. I would definitely argue that upon winning the Dem nomination, he would not longer be the most popular politician in America. His opponents in the primaries and the GOP would see to that.