When Robert F. Kennedy was assassinated just minutes after winning California's 1968 Democratic primary, the United States was fiercely divided. Many looked to him to help heal that divide. That's part of an unfulfilled legacy his son, Robert Kennedy Jr., describes in his new book, American Values." It's a history of the ... 40-year tension between my family and the CIA," he said. The Kennedy feud with the CIA was multi-generational. The family patriarch, Joseph Kennedy, sat on a commission that called for an end to the CIA's paramilitary operations. And his sons John and Robert Kennedy both railed against the CIA's role in Vietnam. "The first thing [my father] was gonna do was to remove the clandestine services from the CIA and make the CIA ... an intelligence gathering organization," he said. But the seeds of doubt about who killed his father weren't planted by that notion. "I never suspected at any level that anybody other than Sirhan Sirhan had killed my father until maybe three years ago," he said. What changed for Kennedy? "Well, Paul Schrade." Schrade was a close friend of Robert Kennedy and was with the candidate the night he was shot. Schrade ... has insisted for decades that Sirhan could not have acted alone. He's now raised serious questions in Kennedy Jr.'s mind as well. "It's hard to believe that Sirhan shot my dad, that his bullets hit my dad. Because Sirhan was always in front of my father. And yet, all shots, all the four shots that hit my father came from behind him," he said.