Your head will explode when you read this. From NewsBusters: The Huffington Post explains that "Melissa Lafsky is the deputy web editor at Discover magazine, where she writes the Reality Base blog. She was previously the editor of the New York Times's Freakonomics blog, and is a former associate editor at HuffPo's Eat The Press." So she's a major-media-certified pundit when she wrote about Chappaquiddick drowning victim Mary Jo Kopechne on Arianna's pages today:Mary Jo wasn't a right-wing talking point or a negative campaign slogan. She was a dedicated civil rights activist and political talent with a bright future....We don't...