Career
Duncan ran for governor as a Democratic-Republican during the Louisiana gubernatorial election of 1820, losing to Thomas B. Robertson.
Duncan ran for governor as a Democratic-Republican during the Louisiana gubernatorial election of 1820, losing to Thomas B. Robertson.
Duncan was a member of the "New Orleans Association" which included attorneys Edward Livingston and John R. Grymes, merchant John K. West, smuggler Pierre Laffite, and pirate Jean Laffite.