The Kennedy mystique

I'm watching a History Channel program on the Kennedy's, and I can't help but wonder how differently the world would view John Kennedy had he lived and earned a second term. His first term started off in bumbling fashion, and there is little reason to believe that the events of LBJ's Presidency would not have occured during a Kennedy second term. Instead, JFK's legacy was frozen in time during a period of popularity, aided by Jackie Kennedy who formalized the Camelot myth.