Two thoughts:
There is no Dem counterpart to those two, or does anyone know of them to tell me?
Dems always stick together, vote together and have no Jeff Flake, Romney or S. Collins causing them trouble. For Dems it's always: "Somebody get Schumer (or Pelosi) to return my call, please. I need to know what I think, what to say to reporters and how I'll vote on the bill later today."
If a Dem with a brain ever gets elected they could think for themselves after evaluating facts. No worries. I read too much science fiction in the past so I make things up like that.
You're right about that I think. The dems do tend to be one cohesive unit or put another way; drones/puppets/mindless/liars. But loyal. They are loyal to their criminal enterprise the way the Mafia soldiers are. Not surprising since they share such a striking similarity in their conduct and crimes.