Explosive claims by Internet sleuths, which were prompted after reading stolen documents belonging to Mr. Podesta, have been derided as “viciously phony” by Fox News’ Howard Kurtz. A tweet by Mr. Breitbart shortly before his March 1, 2012, death is now being cited by online researchers as proof that they are onto something big. “How prog-guru John Podesta isn’t household name as world class underage sex slave op cover-upperer defending unspeakable dregs escapes me,” Mr. Breitbart wrote Feb. 4, 2011. The conservative icon’s death at age 43 was attributed to “heart failure.” “Hi John, The realtor found a handkerchief (I...