60 years after that horrible day in November when our 35th president was gunned down in Dallas, one of only two secret service agents from that detail still alive today gives his reflections and first-hand account and explains the difference between facts and theories.   Clint Hill is joined by his wife and co-author Lisa McCubbin Hill to discuss the day America lost its innocence, a secret service reunion 60 years in the making, and the 60th anniversary commemorative edition of their book Five Days in November.