When I ponder the things that I'd like to see in video games someday, a fully nekkid Congressman is not high on the list.
Nonetheless, Kotaku reports that a cut scene in GTA IV: The Lost and Damned, scheduled to release tomorrow, features a male character displayed with full frontal nudity:
[Congressman] Stubbs, in his first meeting with lead character Johnny Klebbitz, is receiving a massage at the private gentleman's club Jousters when we meet him. The Congressman, dressed in nothing but a towel, quickly becomes pretty comfortable with his new biker friend, choosing to deliver his monologue in the buff...
The ESRB rating for the game—which is "M" for Mature—does make mention of the gratuitous digital d*ck on display, noting that the game has "Nudity" in its content. The original Grand Theft Auto IV is listed as having only "Partial nudity."