instead become a Cabinet officer in a second Eisenhower administration, in order to give him administrative experience before a 1960 presidential run. Nixon believed this would destroy his political career. When Eisenhower announced his reelection bid in February 1956, he hedged on the choice of his running mate, saying it was improper to address that question until he had been renominated. Although no Republican was opposing Eisenhower, Nixon received a substantial number of write-in votes against the president in the 1956 New Hampshire primary election. In late April, the President announced that Nixon would again be his running mate. Eisenhower and Nixon were reelected by a comfortable margin in the November 1956 election. In early 1957, Nixon undertook another foreign trip, this time to Africa. On his return, he helped shepherd the Civil Rights Act of 1957 through Congress. The bill was weakened in the Senate, and civil rights leaders were divided over whether Eisenhower should sign it. Nixon advised the President to sign the bill, which he did. Eisenhower suffered a mild stroke in November 1957, and Nixon gave a press conference, assuring the nation that the Cabinet was functioning well as a team during Eisenhower's brief illness. On April 27, 1958, Richard and Pat Nixon reluctantly embarked on a goodwill tour of South America. In Montevideo, Uruguay, Nixon made an impromptu visit to a college campus, where he fielded questions from students on U.S. foreign policy. The trip was uneventful until the Nixon party reached Lima, Peru, where he was met with student demonstrations. Nixon went to the historical campus of National University of San Marcos, the oldest university in the Americas, got out of his car to confront the students, and stayed until forced back into the car by a volley of thrown objects. At his hotel, Nixon faced another mob, and one demonstrator spat on him. In Caracas, Venezuela, Nixon and his wife were spat on by anti-American demonstrators and their limousine was attacked by a pipe-wielding mob. According to Ambrose, Nixon's courageous conduct "caused even some of his bitterest enemies to give him some grudging respect". Reporting to the cabinet after the trip, Nixon claimed there was "absolute proof that [the protestors] were directed and controlled by a central Communist conspiracy." Secretary of State John Foster Dulles concurred in this view, as did his brother Director of Central Intelligence Allen Dulles in his own rebuke.