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I don't doubt that many are knowingly lying, just saying that some probably believe this crap. And I heard that same liar that you mentioned, and agree with everything you said. He was clearly and egregiously lying, and the host did nothing to challenge or correct him. I understand their policy of not disputing opinions, but this was a clear case of factual wrongness. They just let it slide. But, while I can't prove it, I'm convinced that CSPAN has a bias towards the far right, in terms of how many crazyass far-right loonies and liars it has on its shows. They'd probably call it being "fair and balanced", but Boehlert, Alterman, Glenn and others have pretty much put the lie to that nonsense. Putting on a dishonest shill from the Moonie Times or Heritage does not balance out someone from the NY Times or Brookings (and we all know how bad Brookings has gotten in recent years). I don't know if this is because Brian Lamb is a closeted wingnut, they're forced to do this by their cable industry owners, or it's just fear of the RWNM, but they clearly do this. And they're far more indulgent with crazy and dishonest far-right callers than they are with angry and mostly factually correct left-leaning callers.
So pervasive has been the RWNM's seepage into the media and national consciousness, that this happens on autopilot at this point, and is going to take years to reverse, both systemically and consciously. As discredited as their policies are, a lot of people still automatically give more credit to the right than to the left. That needs to change.