Remember when Caroline Kennedy convinced media executives to bury the History Channel's The Kennedys mini-series? We may now know what her bargaining chip was: ABC News (which has corporate ties to the History Channel) is preparing to air a series of never-before-heard audio tapes of Jackie Onassis, possibly conversing with historian Arthur Schlesinger, Jr. The tapes are either the juiciest Kennedy dirt imaginable or totally banal, depending who you ask.