Isiah Whitlock Jr born September 13 1954 is an American actor He is most famous for his role on the HBO television series The Wire as corrupt state senator Clay Davis In 2011 Whitlock played an insurance agent named Ronald Wilkes in the film Cedar Rapids Wilkes is a selfdescribed fan of The Wire and does an impersonation of character Omar Little Whitlock has said that the references to the series were written in before he became involved in Cedar Rapids He is also notable for appearing in Spike Lee films She Hate Me and 25th Hour as Agent Amos Flood In all three projects Whitlock established a catchphrase from his characters distinct pronunciation of the word shit sheeeit He appeared as Eugine a supporting role in the 2003 film Pieces of April He had a bit part in Goodfellas as a doctor who gives Henry Hill a Valium while attending to his brother In 2007 he played Ethan Banks in Enchanted Whitlock has made appearances on Chappelles Show and has played various characters on Law Order and its spinoff Law Order SVU He also appears in promotional spots for the Wii video game PunchOut portraying the character Doc Louis