With the 15th anniversary of the Oklahoma City bombing Monday, former President Bill Clinton is playing a starring role in the liberal effort to draw what the New York Times calls "parallels between the antigovernment tone that preceded that devastating attack and the political tumult of today." The short version of the narrative is: Today's Tea Partiers are tomorrow's right-wing bombers. On Friday, Clinton spoke at a symposium on the bombing organized by the liberal think tank Center for American Progress, founded and run by John Podesta, the former Clinton White House chief of staff who also directed the Obama...