sentences:  From 1817 to 1821 he served as Hampden County Attorney.Lathrop was elected as a Federalist to the Sixteenth and Seventeenth Congresses, reelected as an Adams-Clay Federalist to the Eighteenth Congress, and reelected as an Adams candidate to the Nineteenth Congress (March 4, 1819 – March 3, 1827).He served as chairman of the Committee on Revisal and Unfinished Business (Seventeenth and Eighteenth Congresses).