what date did kennedy become president?
1/3/1947
contradiction
 Kennedy entered the Senate in a November 1962 special election to fill the seat once held by his brother John . He was elected to a full six @-@ year term in 1964 and was reelected seven more times . The Chappaquiddick incident on July 18 , 1969 , resulted in the death of his automobile passenger , Mary Jo Kopechne . Kennedy pleaded guilty to a charge of leaving the scene of an accident ; the incident and its aftermath hindered his chances of ever becoming President of the United States . His one attempt , in the 1980 presidential election , resulted in a Democratic primary campaign loss to incumbent President Jimmy Carter . 

entailment
 Kennedy was sworn in to the Senate on November 7 , 1962 . He maintained a deferential attitude towards the older , seniority @-@ laden Southern members when he first entered the Senate , avoiding publicity and focusing on committee work and local issues . Compared to his brothers in office , he lacked John 's sophistication and Robert 's intense , sometimes grating drive , but was more affable than either of them . 

contradiction
 The assassination of President John F. Kennedy showed the need for a clear way to determine presidential succession in the context of the Cold War . The new President , Lyndon B. Johnson , had once suffered a heart attack , and the next two people in line for the presidency were the 71 year old Speaker of the House John McCormack , and the 86 year old Senate President pro tempore Carl Hayden . Senator Birch Bayh succeeded Kefauver as Chairman of the Subcommittee on Constitutional Amendments and set about advocating for a detailed amendment dealing with presidential succession . 

entailment
 Kennedy was again much talked about as a contender in the 1976 U.S. presidential election , with no strong front @-@ runners among the other possible Democratic candidates . But Kennedy 's concerns about his family were strong , and Chappaquiddick was still in the news , with The Boston Globe , The New York Times Magazine , and Time magazine all reassessing the incident and raising doubts about Kennedy 's version of events . In September 1974 , Kennedy announced that for family reasons he would not run in the 1976 election , declaring that his decision was " firm , final , and unconditional . " The eventual Democratic nominee , Jimmy Carter , built little by way of a relationship with Kennedy during his primary campaign , the convention , or the general election campaign . Kennedy was up for Senate re @-@ election in 1976 ; he defeated a primary challenger angry at his support for school busing in Boston , then won the general election with 69 percent of the vote . 

neutral
 Kennedy 's goal was accomplished on the Apollo 11 mission when astronauts Neil Armstrong and Buzz Aldrin landed their Lunar Module ( LM ) on July 20 , 1969 , and walked on the lunar surface , while Michael Collins remained in lunar orbit in the Command / Service Module ( CSM ) , and all three landed safely on Earth on July 24 . Five subsequent Apollo missions also landed astronauts on the Moon , the last in December 1972 . In these six spaceflights , twelve men walked on the Moon . 
