Senator R. Clayton "Clay" Davis is a fictional character on the HBO drama The Wire, played by actor Isiah Whitlock, Jr. Davis is a corrupt Maryland State Senator with a reputation for pocketing bribes.

Davis however remains protected throughout the series by other ranking politicians and Police Commissioner Ervin Burrell. Davis is known for his manner of cursing, used often when confronted with bad news, comically elongating the word "shit" as "sheeeeeit." When Lieutenant Daniels' detail discovered $20,000 of Avon Barksdale's money in the car of Davis' driver, they tried to expand the investigation to include Davis in the wiretaps. Deputy Commissioner Burrell called Daniels into a closed-door meeting with the Senator, but he was unwilling to drop the case.

Burrell nonetheless soon pulled the plug on the investigation, and Clay Davis' involvement went uninvestigated. It was mentioned however that Davis had a file under federal investigation that was being built for over two years suspecting him of accepting illegal liquid assets.

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