That's the new liberalism. If you do not parrot the "party line" you are "part of the problem."
It is instructive that the author of the HuffPo piece is Joseph Palermo, who I have taken apart before, and who is in every way imaginable the prototypical Obama supporter. As Joe Klein noticed so well, such "progressives" are prone to...
...a fierce, bullying, often witless tone of intolerance that has overtaken the left-wing sector of the blogosphere. Anyone who doesn't move in lockstep with the most extreme voices is savaged and ridiculed—especially people like me who often agree with the liberal position but sometimes disagree and are therefore considered traitorously unreliable.
Hey, witless bullying is now a mode of presidential campaigning. Aren't we lucky?