Bradley Whitford is the 4th veteran of the TV series "The West Wing" to play a guest role on "In Plain Sight". The other 3 are Joshua Molina, Allison Janney, and Richard Schiff. Series star Mary McCormack is also a West Wing alum.
Bardley Whitford and Mary McCormack had also worked together in New York on the Broadway stage in 2008 with the revival of, "Boeing Boeing".