"Inclusive Left." Now THAT'S funny.
You're obviously watching a different movement than I am.
Watch what happens to politicians, newspapers, or anyone else who steps on inch off the party line. Hillary Clinton and the Washington Post have both been hammered lately on things like this. Been keeping track of Lieberman lately? Even Feinstein is being outflanked on her left.
Leftist and liberal blogs like Kos show this behavior all the time. The most obsessive religious movement has nothing on them in this regard.
Of course, you're welcome to point out some mover and shaker on the Left who has stepped off the line and still has the respect of the movement.