 Witter was a member of the New York State Assembly (Tioga Co.) in 1896, 1897, 1898, 1899 and 1900; and was Chairman of the Committee on Electricity, Gas and Water Supply in 1900.He was again a member of the State Assembly in 1916, 1917, 1918, 1919, 1920, 1921, 1922, 1923, 1924, 1925, 1926, 1927, 1928 and 1929; and was Chairman of the Committee on Agriculture from 1918 to 1929.He died on January 9, 1930, at his home in Berkshire, New York; and was buried at the Evergreen Cemetery there.