A spokeswoman for Fox News, Irena Briganti, declined to comment on Media Matters’ efforts, but the group draws regular barbs from Fox hosts Beck and Bill O’Reilly.

“Tonight is not an episode you casually watch and take out of context like Media Matters does,” Beck remarked last month.

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A more extended attack came in February on the freewheeling late night show Red Eye, which conducted a mock interview with a purported Media Matters employee.

“It’s horrible. All we do is sit and watch Fox News and make up stuff about Fox News. It is the saddest place I have ever seen in my life. I think about it, and I want to throw up,” the mock employee said. “I get to work and I take off my clothes, and they strap me into a chair in front of a TV with [Fox News Channel] on. They keep my eyelids propped open like in “Clockwork Orange,” and I sit and type all day.

“If there was no Beck, George Soros would come down and demand we make it up,” the “interviewee” continued. “I would watch the “Flintstones” and transcribe Fred Flintstone’s words and attribute them to Beck. It was the only way to get Soros to stop hitting me.”

(A Soros associate said the financier, who gave Media Matters $1 million last year, did not earmark it for the Fox campaign. Soros suggested in a recent CNN interview that the Fox depictions of him as a sinister media manipulator would better be applied to Murdoch.)

In some views, the war between Media Matters and Fox is not, necessarily, bad for either side. Media Matters has transformed itself into a pillar of the progressive movement with its aggressive new brand of media campaigning. And the attacks cement Fox’s status on the right.

“Fox is happy about it — and it makes their position more vivid among their supporters,” said Paul Levinson, a media studies professor at Fordham University. “One way of keeping your core supporters happy is to be attacked by people your core supporters don’t like.”

But Media Matters says its digging has begun to pay off. The group has trickled out a series of emails from Washington Bureau Chief Bill Sammon, leaks from inside the network, which show him, for instance, circulating a memo on “Obama’s references to socialism, liberalism, Marxism and Marxists.”

The leaks are part of a broader project to take advantage of internal dissent, Media Matters Executive Vice President Ari Rabin-Havt said.

“We made a list of every single person who works for Fox and tried to figure out who might be disgruntled and why, and we went out to try to meet them,” he said. “Clearly, somebody in that organization is giving us primary source documents.”

Media Matters, he said, is also conducting “opposition research” on a dozen or so “mid- and senior-level execs and producers,” a campaign style move that he and Brock said would simply involve recording their public appearances and digging into public records associated with them.

And Brock’s 2010 planning memo offers a glimpse at Media Matters’ shift from media critic to a new species of political animal.

“Criticizing Fox News has nothing to do with criticizing the press,” its memo says. “Fox News is not a news organization. It is the de facto leader of the GOP, and it is long past time that it is treated as such by the media, elected officials and the public.”