That's a famous quote from Stephen Colbert-- I think it might be from his White House Press Correspondents Dinner speech.
I use it here because, in my opinion, NPR news tries to cover the news objectively, including choosing to cover stories that are often neglected by more mainstream media. Many of these "reality-based" stories reflect poorly on the Bush administration (such as poverty in America, the real state of the war in Iraq, how Katrina was handled... Bill Moyers-type stories), and hence "reality has a liberal bias." Fox News conveniently ignores these stories, for the most part.
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Diane Rehm, Terry Gross, Daniel Shore, and Bill Moyers are congenitally incapable of objectivity and their ideological bias prohibits them from ravaging liberal politicians for their incompetence and blame in the mishandling of "reality-based" stories such as Katrina, The Great Society, Mae & Mac, etc.
Exactly what is the "real state" of the war in Iraq that only NPR manages to capture? Since the Iraq War is not even in the top five issues for the voting public, NPR's drum beat that the U.S. lost the Iraq War doesn't appear to be working anymore.