Harrison, Pat, 1881-1941. Letter, 1928 Oct. 1. 1 letter. Location: Misc. Pat Harrison was a U.S. Representative (1911-1919) and U.S. Senator (1919-1941) for Mississippi. Pat Harrison, writing in his capacity as a member of the Advisory Committee of the Democratic National Committee, expresses to a party supporter in Mississippi his optimism for the presidential candidacy of Al Smith. Mss. 3850.