Who threatened nuclear war during the 1964 election against LBJ?

The correct answer is Barry Goldwater. He was the Republican candidate who ran against Lyndon B. Johnson in the 1964 presidential election. Goldwater's campaign became notable for its hawkish stance on foreign policy, particularly in relation to the Cold War and the use of nuclear weapons. He famously suggested that he would not hesitate to use nuclear weapons if it meant achieving victory in a conflict, which was a stark departure from the more cautious approach taken by the Kennedy administration and later by Johnson. This rhetoric raised concerns among voters, as it highlighted a willingness to confront the Soviet Union aggressively, potentially escalating tensions during a volatile period in American history.