see also Glenn Greenwald's comments.  Here is a snippet:

Last night was a perfect microcosm of how our political process works. The Right creates stupid, petty personality-based attacks to ensure that our elections aren't decided on issues (where they have a decisive disadvantage). Media stars -- some due to sloth, some due to ideology, some due to an eagerness to please the Right and convince them how Good and Fair they are -- eat up the shallow trash they're fed and then spew it out relentlessly, ensuring that our political discourse is overwhelmed by it, our elections dictated by it. That happens over and over. It's how our media and our elections function. Last night was just an unusually transparent and particularly ugly expression of it.