Maybe, but when they disagree with them, do they later come back hat in hand and appoligize the way republicans do with Rush? Look at how Rush made Steele his bitch.
If Olbermann had Rush's ratings and, thus, his influence with voters, you'd see Dems going to Olbermann on their knees each time he called them out. If Rush were a Democrat, you'd see Dems genuflecting before him.