while adams jr. was the first black member of the nebraska unicameral, his predecessors in the nebraska legislature include matthew o. rickets (first elected in 1892), john andrew singleton (first elected in 1926) and dr. aaron manasses mcmillan (first elected in 1928). adams married constance singleton in 1931, constance was the daughter of guy singleton and blanch ellen braxton. guy was the brother of john andrew and the son of millard f. singleton.