The linked Politico.com story describes two such outfits, the far-left Media Matters (its founder, David Brock, is pictured on the left above) and the far-right Breitbart.com (run by radical right-wing slimeball Andrew Breitbart, pictured on the right above -- the lovely guy who went around tweeting that he was glad Teddy Kennedy was dead on the same day the Old Liberal Lion died -- slimey stuff). If you happen to ever visit and/or read any of the material on any of these far left or far right websites, just make sure you take every single thing they say with a grain of salt. Because it's all cast in spin and in ideology. In other words, the dictionary definition of propaganda. And it spews equally from both extremes. So what would I recommend as a fairly straight-arrow and non-biased source of political commentary and news? None other than the linked Politico.com. Great web site. Even some of my right-wing and left-wing acquaintances agree on that one!
http://www.politico.com/news/stories/0310/34016.html