In a December 12 Politico article, serial smear merchant Andrew Breitbart said of Media Matters: “I'm 100 percent at war with those people.” From the article:

Andrew Breitbart, who's already made some dents in what he considers the “Democrat-media complex” in 2009, says he's going to roll out his own site, Big Journalism, a few days earlier - designed, he says, to report stories that the mainstream media is either missing or willfully ignoring.

[...]

Breitbart, who was a co-developer of the Huffington Post, knows how to generate buzz online, and even uses his Twitter feed for a public battle with liberal media watchdog, Media Matters. “I'm 100 percent at war with those people,” he said.

Previously:

Andrew Breitbart's obsession with “MediaMutters” takes him 'round the bend

Breitbart tweets: “MEDIAMUTTERS, DAVID BROCKOVICH® ON ANTI-BREITBART BINGE”

Breitbart fabricates smear that SEIU's Stern is “sending SEIU goons” to “beat up innocent Americans”

Breitbart claims White House literally “directed” town hall violence