Kamala and Cory are progressive darlings now?
Ain't no progressives fukking heavy with those two, their natural home is the centrist Dem establishment. They'll have more trouble winning over progressives than the centrists who are already behind them. Both the Obama and Clinton machines are already signalling their preference for those two, along with Eric Holder and Deval Patrick. Cory and Kamala can definitely win over progressives far easier than Biden though.
White working class in those states went to Trump because Hillary didn't even bother making an argument about their declining situation while Trump did. A progressive message can address that concern far more adeptly than the empty anti-Trump civility posturing Biden has been running with.
Actually you're right, Cory and Harris are more centrist, but that makes it even worse. Neither moderates nor progressives really fukk with them, so they wouldn't make great presidential candidates. I could see both as VP though.