Because they are all in the same clubhouse.
I’ve been a “vote blue no matter who” person since Trump came on the scene.
But most Democrats are simply Republican Lite right now.
There are something like 90 congress critters in the House progressive caucus, a big rise since a few years ago.
So the litmus test during primary season ought to be: “Are you, as a candidate, aware of the damage 40 years of Reaganism has done to this country, and will you f**kin’ do something about it?”