People that get too far to the left start sounding just like the people too far to the right.
I'd noticed that, too. I think the first example of it I can remember is a guy on Los Angeles television many years ago who had a show called "Hot Seat". I don't remember his name, I think it was Wally George. He was the perfect example of that: He was so far left, he'd practically wrapped around to the extreme right.
My high school friends told me he was Rebecca DeMornay's father. (You know Rebecca: "Have you ever made love on a train, Joel?") Dunno if that was true or not.