They are, you just don't want to admit they do.
Do you know how bills get made in congress?
I don't like Biden, I just hate him less Sanders. Both candidates are vulnerable to this, and if the "progressives" split this easily they were never Democrats to begin with. They'll leave AOC out in the cold.I get it you like Biden, but the dude is a disaster and will split the party, and Some progressives will not vote for him, they are not obligated to do so.
Biden has already shit on them, and shows he will change nothing, so why vote then?
Trump bad, sad is not a winning issue, if you are going to change nothing.
You're not going to change anything other then make it easier for Trump to win by not voting for the Democratic nominee. How did that work out in '16?