...because Dems are flat out terrified of them. They get away with bloody murder because they know if Dems try to respond they'll be accused of being...fascists, totalitarian, a mob of angry black men (just fill in the blank). And it sticks! By contrast, the Rs truly are a mob of fascist, totalitarian, angry white men...because Dems are terrified to call them out on it. Imagine if Pelosi had gone after Rove. Of course she stood down like a good Democrat. Now imagine if the shoe was on the other foot. We know what the Rs would do. And the Dems would serve our own up on a platter a la Anthony Weiner.