The late Andrew Breitbart, a former assistant to Matt Drudge, ran BigGovernment.com and other websites (now found at Breitbart.com). In July 2010, the Obama White House forced U.S. Dept of Agriculture employee Shirley Sherrod to quit after BigGovernment posted a 100-second video excerpt purporting to show that, during a speech to the NAACP, Sherrod had boasted about discriminating against a white farmer while she was a federal employee in the Obama administration. Actually, as Breitbart later semi-corrected, Sherrod was describing events in the 1980s when she was Georgia field director for the Federation of Southern Cooperatives, a civil rights group set up to help Black farmers long discriminated against by the U.S. Dept of Agriculture. More importantly, a fuller version of the speech (first aired by CNN) showed that Sherrod had told the story to illustrate how she had overcome her bias toward whites and ultimately helped the white farmer save his farm.
Ten months earlier, in 2009, other selectively-edited tapes distributed by Breitbart's website (featuring James O'Keefe and played repeatedly on Fox News and elsewhere) helped put the anti-poverty group ACORN out of business. Rachel Maddow dissected the distorted presentation that doomed ACORN. (Democratic operative John Podesta was on ACORN's advisory council and investigated the Breitbart's video charges against ACORN; it appears that the recent conspiracy theory about Podesta and Hillary trafficking underage girls out of a DC pizza parlor is partly fueled by the ACORN sex-trafficking hoax.)
It wasn't just Fox News that promoted the misleading ACORN story. The Public Editor of the paper of record, the New York Times, went to absurd lengths to defend his paper's inaccurate coverage.