Thompson has signed on with Hollywood's William Morris Agency, the entertainment news Web site reported.
Before his failed bid for the Republican candidacy, Thompson was a regular on television's "Law & Order" and had appeared in dozens of TV shows and movies.
He also served as a real-life prosecutor who worked on the Watergate committee in the mid-1970s and worked for 17 years as a lobbyist before being elected U.S. senator in Tennessee in 1994.
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