The radical-left anti-war group Code Pink successfully pranked the mainstream media by creating a phony "press release" attributed to the disgraced Blackwater private security firm. The phony press release announced that Blackwater was hiring a new "Public Integrity" director whose job was to "put the mercy back in 'mercinary.'" And CBS News, the AP, and the blog Politico.com all fell for it. Sheesh.
This seems to fall into a pattern of bias that has been observed for some time: press releases from left-leaning organizations (or as in this case, press releases with a heavy dose of lefty "truthiness") are gobbled up by the mainstream media with little or no fact checking or balanced response.