The latest test of the "independent fact-checkers" just unfolded in a Joe Biden interview with Peter Doocy of Fox News in Dubuque, Iowa. It's cut, and dried. Biden is on record opposing Obama's decision to take out Osama bin Laden in 2011. But now he's claiming he never did. It's an easy "Pants on Fire" for PolitiFact. It's Four Pinocchios for The Washington Post.