Barry Goldwater was a prominent American politician and five-term U.S. Senator from Arizona, known for his significant influence on the conservative movement in the United States during the mid-20th century. He became the Republican Party's nominee for president in 1964, advocating for a return to limited government, individual liberties, and a strong anti-communist foreign policy. His ideas played a crucial role in reshaping the Republican Party's ideology and paved the way for the conservative resurgence in later decades.