Because there is no preparation for the burdens and responsibly of the Presidency, it would take JFK,  almost nine-hundred of his thousand days to reach his apogee.  With the death of his infant son Patrick, as a catalyst, the final 100 days of the Kennedy presidency, which began 50 years ago this month, would become the capstone of Camelot and the defining time of a promised unfulfilled.Kennedy historian Thurston Clark, in JFK's Last Hundred Days: The Transformation of a Man and the Emergence of a Great President, takes us deep inside those final 100 days.My conversation with Thurston Clarke: