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"If we lose but come close, moderate Republicans might take notice," said Buddy Oswald, an attorney and educator.

Philip Shenon, who wrote a 2013 book about the assassination, told the Associated Press that previously released documents described a trip Oswald took to Mexico City in September 1963, months before the assassination.

A government commission determined that President Kennedy was shot by Lee Harvey Oswald, a Marine veteran and self-described Marxist who had defected to the Soviet Union and later returned to the US.

Officials arrested a worker in the book depository building named Lee Harvey Oswald, a former Marine and Marxist sympathizer who at one point tried to become a citizen of the Soviet Union.

According to some theories, Oswald was trained for his deadly mission there.