address fears among Protestants that his Roman Catholicism would impact his decision-making, Kennedy told the Greater Houston Ministerial Association on September 12, 1960: "I am not the Catholic candidate for president. I am the Democratic Party's candidate for president who also happens to be a Catholic. I do not speak for my Church on public matters – and the Church does not speak for me." He promised to respect the separation of church and state, and not to allow Catholic officials to dictate public policy to him. Kennedy also raised the question of whether one-quarter of Americans were relegated to second-class citizenship just because they were Roman Catholic. Kennedy would become the first Roman Catholic to be elected president—it would be 60 years before another Roman Catholic, Joe Biden, was elected. Kennedy's campaign took advantage of an opening when Rev. Martin Luther King Jr., the civil-rights leader, was arrested in Georgia while taking part in a sit-in. Nixon asked President Dwight D. Eisenhower to pardon King, but the President declined to do so. Nixon refused to take further action, but Kennedy placed calls to local political authorities to get King released from jail, and he also called King's father and wife. As a result, King's father endorsed Kennedy, and he received much favorable publicity among the black electorate. A letter to the Governor of Georgia regarding Martin Luther King, Jr.'s, arrest also helped Kennedy garner many African American votes. John F. Kennedy asked Governor Ernest Vandiver to look into the harsh sentencing, and stated his claim that he did not want to have to get involved in Georgia's justice system. A member of Kennedy's civil rights team and King's friend, Harris Wofford, and other Kennedy campaign members passed out a pamphlet to black churchgoers the Sunday before the presidential election that said, ""No Comment" Nixon versus a Candidate with a Heart, Senator Kennedy." On election day, Kennedy won the black vote in most areas by wide margins, and this may have provided his margin of victory in states such as New Jersey, South Carolina, Illinois, and Missouri. Researchers found that Kennedy's appeal to African American voters appears to be largely responsible for his receiving more African-American votes than Adlai Stevenson in the 1956 election. The same study conducted found that white voters were less influenced on the topic of civil rights than black voters in 1960. The Republican national chairman