In fact, I'd say that most of those on the Indy Left who are the fiercest critics of Democrats FROM THE LEFT are the ones most targeted by the Republicans and Rightists like Trumpster for marginalization.
Their criticism of the Democrats is NOT that they are the same as Republicans, although the establishment of the Dems seems to be moving rightward at such a steady clip that they are dangerously close to apeing Reaganite Republicans.