Played HIMSELF in the film Marie (1985), based on a case where he represented a wronged employee
Played the same character in 4 iterations of the crime-drama series "Law & Order", plus a spin-off, "Conviction".
"When he joined the cast of Law & Order (1990) in the fall of 2002, Thompson (District Attorney Arthur Branch) became the first serving U.S. Senator to take a regular TV acting job. His term did not end until January 2003."
Left politics (2002) for a role in Law & Order. Left his role on Law & Order to return to politics (Republican Presidential primary, 2007). Returned to acting after failing to win a nomination.