JFK defeated Nixon in 1960. Nixon then proceeded to lose the '62 election for governor of California. His rage was heard by a 17-year old Don McLean over the telephone. He was on the phone with the wrong number because the switchboard operator at Southwestern Bell in St. Louis screwed up. The rage turned to a rant about 'time-travel,' and McLean was inspired. fios tole one of Doc Brown's prototypes and went back, only he screwed up and caused the 1959 plane crash in an Iowa cornfield that killed Buddy Holly. Distraught, he eventually would write 'American Pie,' which by the way is a cryptic retelling of the events that
caused the plane crash in the first place. But the time currents were all screwed up already. Alfred Hitchcock got a vision of the crash back in 1957 or so, inspiring him to create that one scene
North by Northwest. That scene was seen in another vision by Amelia Earhart in 1937, inspiring her to do the same stunt over the Pacific, only she screwed up and crashed. Or time-slipped, as her plane jumped forward several years and triggered the whole PT-109 incident.
The Time Patrol got wind of the incident(s), and sent one of their operators, Lee Harvey Oswald (his whole life story was merely a cover) to eliminate the source of the temporal anomalies, which due to PT-109 was mistakenly identified as one John F. Kennedy. Not only did Oswald kill the wrong guy, he also screwed up, killing Conolly as well and getting caught by local police. Oswald had a history of failures and botched operations, so the Time Patrol sent their Internal Affairs agent Jack Ruby to eliminate Oswald, but Ruby did not do much better, mistakenly carrying out the operation on national television and getting captured himself. Fortunately, his cover held, and that was the end of that. In the 1970s and early 1980s Time Patrol operations broke up AT&T as a whole vainly trying to eliminate the source of the temporal anomalies, but Southwestern Bell still exists, so...
Long story short - it was a switchboard operator at Southwestern Bell in St. Louis in 1962. And the Time Patrol has failed us.
