DAILY CALLER INVESTIGATION: Inside Media Matters: Sources, memos reveal erratic behavior, close coordination with White House and news organizations.

My favorite bit: “Greg Sargent [of the Washington Post] will write anything you give him. He was the go-to guy to leak stuff.” Lots of other names named, too.

Of course, to the extent that Media Matters affects coverage it’s because left-leaning journos regard it as legitimate, and want to help. In this regard, like JournoList, it’s a “self-herding device.”