Democratic Primaries

He believes it contains the fundamental solution to all social problems, but getting there is a sisyphean task. Would any of us, as sensible (!) extremists, think it was a good idea to distract everyone from the revolution to fixing thousands of issues, like reparations for descendants of former slaves (that would offend many in a populist movement) a jailed teen who can't get an abortion (also problematic for some socially conservative populists), air pollution crossing state lines from a new factory, rent gouging in Burlington, need for elder daycare and tax deductions for caregiving, etc?

No. Eye on the prize, and Sanders is hard wired to that.

But there's another thing: Sanders doesn't much like and certainly doesn't respect individual people. Down to the teeming masses from the lonely heights where his far vision is possible is not where his passionate caring is focused. Much in the same way Trump cares about issues if and only as long as he sees himself in them, Sanders cares about individual issues if, and only as, he can use them to point up the desperate need of humanity for his big solutions.

He has a revolution to run, not a free legal clinic or wasting his time being 1 in 100 senate votes he considers corrupt anyway.

Biden, or "good old Joe," on the other hand, is famous for liking and caring about people. Trust by minorities that he's a friend in DC has been developed over decades.

You see the differences in body language. Sanders swats irritably at faces to reject their input and make them stop talking, and is effectively as brusque and dismissive when a group wants to know what he'll do as president about rabid RW judges persecuting their people. Biden hugs and leans in to talk one on one, listens, and discusses what he believes can and should be done to fix their problems.

Huge differences that go to the very core of who they are and how incredibly different they are.