Who was the Governor of Mississippi in 1964?

Ross R. Barnett (born January 22, 1898 in Standing Pine, Mississippi; died November 6, 1987 in Jackson, Mississippi) succeeded James P. Coleman as the fifty-second Governor of Mississippi, serving between January 19, 1960 and January 21, 1964. Following the end of Barnett's term as Governor, Paul B. Johnson Jr. (born January 23, 1916 in Hattiesburg, Mississippi; died October 14, 1985 in Hattiesburg, Mississippi) became the fifty-third Governor of Mississippi, serving between January 21, 1964 and January 16, 1968.