Republican pollster Frank Luntz on Media Matters:
At the least, the organization has succeeded in proving nettlesome to Republicans, as well as the mainstream press at times. “I think they are one of the most destructive organizations associated with American politics today,” said Frank Luntz, a pollster for Rudolph W. Giuliani and Newt Gingrich who this year has led on-camera voter focus groups on Fox News, a frequent Media Matters target. “They are vicious. They only understand one thing: attack, attack, attack.”
I know I get up every day thinking I work for "one of the most destructive organizations associated with American politics today". Sounds like another one for the quote board.
BONUS: Media Matters covers... Frank Luntz!