I doubt he’d win the primaries but Biden is right in saying that he’s the Democrats’ best hope in 2020. Appeals to the blue collar workers in ways that other candidates cannot, and that is the key to winning back the Rust Belt and therefore the White House.
Oh, I think he can win the primaries, especially if his more progressive opposition is split between so many other candidates.
Though I wonder during the general election campaign if he can end up like Hillary Clinton in 2016 when certain key constituencies didn't show up in the required numbers in key states, despite winning the overall popular vote. He could make up WWC support in some states, but fall short with other constituencies (like young people and women) in others.