Cushman was elected as Democratic-Republican from Massachusetts to the Sixteenth Congress (March 4, 1819 – March 3, 1821). When the State of Maine was admitted into the Union, he was also elected as a Democratic-Republican member to the Seventeenth Congress, and reelected as an Adams-Clay Republican to the Eighteenth Congress (March 4, 1821 – March 3, 1825). He died in Augusta, Maine on January 27, 1834. He was interred in a tomb on the State grounds in Augusta.
Notes
^This district was moved to Maine as a result of the Missouri Compromise in 1820.
^Cushman, Henry Wyles (1855), A Historical and Biographical Genealogy of the Cushmans: The Descendants of Robert Cushman The Puritan From the Year 1617 to 1855, Boston, MA: Little Brown, and Company, p. 186
^Cushman, Henry Wyles (1855), A Historical and Biographical Genealogy of the Cushmans: The Descendants of Robert Cushman The Puritan From the Year 1617 to 1855, Boston, MA: Little Brown, and Company, p. 185
^Cushman, Henry Wyles (1855), A Historical and Biographical Genealogy of The Cushmans: the Descendants of Robert Cushman The Puritan From the Year 1617 to 1855, Boston, MA: Little Brown, and Company, p. 185