I still think the socialists, Bernie in particular, do a better job of speaking to working class people in the rust belt than Joe Biden. As said above, Biden is part of the Democratic elitism that lost those people. Democrats need to speak to those people, and turn them out, and I think you do so with policy arguments that make their lives better, not whatever Joe Biden will be running on (and to be fair we should see where he stands on taxes, health care etc, but I imagine he's pretty much more of where the Democrats were prior to Bernie).