Goldberg's "evidence" of bias in media content consists of anecdotes like the time CBS correspondents snickered off-air when someone said they hailed from Salt Lake City. Matthews works for a network than runs two prime time right-wing talk shows (Carlson and Scarborough) and no liberal talk shows after cancelling its top-rated Phil Donohoue show. It cancelled Donohue for the explicit reason that it was one of the lone voices of liberalism in the media. According to an internal memo, the show threatened to create a "difficult public face for NBC in a time of war" as his show could become "a home for the liberal antiwar agenda at the same time that our competitors are waving the flag at every opportunity."
Matthews himself has been a prime source of right-wing disinformation concerning public confidence in the GOP vs. the Democrats on tax and terrorism policies, as Media Matters has
pointed out again and
again. Mathews also has a well-documented record of gushing over GOP leaders like Bush and McCain while demonizing the Clintons, such as his attempt to tag (centrist, pro-war) Hillary as a "socialist," "Dukakis in a dress," "Madame de Farge of the left" and so on, to the evident pleasure of his pro-Republican paymasters at GE. And, of course, this is a network routinely derided by the right-wing noise machine as excessively liberal.
That cheap flacks like Mathews and Halperin could be sources for an "admitted" liberal bias shows why this myth is ridiculous beyond belief.