O'Callaghan began his political career when he ran for the
State Legislature in 1956 against Hoke Smith. In his campaign, he ran as an "Eisenhower Republican," and a fiscally conservative platform. He pledged to cut taxes, defend the free enterprise system, and "establish faith in the individual as the foundation of our national life." On racial issues, he "vowed to represent all the people of the Fifth district." In
1964, he ran again in the same district, facing Charles L. Weltner a second time. O'Callaghan ran to the right as a
Goldwater Republican. He advocated for the repeal of the public accommodations and fair employment practices of the
Civil Rights Act of 1964, although he qualified his statement. On October 19, he issued a statement declaring he would be more inclined to support the civil rights bill if the fair employment provisions included every business in the country. He also urged voters to comply with the Civil Rights Act once it became the law. His campaign also focused its attacks on Governor
Sanders, Mayor
Allen, and President
Johnson. In the general election, O'Callaghan lost by a margin of 18,966 votes. ==Electoral history ==