From The Propaganda Professor:
Back in 1955, the godfather of (neo)conservatism William F. Buckley launched the National Review, which he intended as an antidote to what he proclaimed was a “liberal bias” in the mainstream media. The belief in such a bias resonated richly (no pun intended) with his fellow wingers, and even began to take root among the gullible masses. Thirty-two years later, Buckley’s nephew Brent Bozell III shifted that narrative into hyperdrive by inaugurating Media Research Center, which is designed to be not just an alternative to the “liberal bias”, but a persistent watchdog to make the liberal media heel. Offering what has become a popular source of citation for right-wing pundits and politicians, MRC presumes to police liberals by calling out their liberalness whenever it appears in the media. Thing is, it ends up indicting itself more than the media or them librulz.
According to the gospel of Bozell and MRC, mainstream media is a lost cause. (Except for Fox “News”, of course.) Not only does it relentlessly push a liberal agenda, but that’s the reason it exists in the first place. The curious thing, however, is that Bozell has tooted from his stump on videos for PragerU, which emphatically distinguishes between liberals and leftists; it is the latter, insists Prager, who are the enemies of all that is holy, while liberals have more in common with conservatives — a clever ploy, you must admit, to incite further polarization.