Mo Cowan

William Maurice “Mo” Cowan (born April 4, 1969) is an American politician and lawyer. He was a United States Senator from Massachusetts from February 1, 2013 to July 16, 2013. He is a member of the Democratic Party. He was legal counsel and chief of staff to Governor Deval Patrick.
Patrick appointed him on as an interim Senator to replace fellow Democrat John Kerry, who resigned to become U.S. Secretary of State.
He did not want to run in the 2013 special election to complete the remainder of Kerry's term. He was replaced by fellow Democrat Ed Markey.
Cowan was the eighth African-American U.S. Senator and the second from Massachusetts after Edward Brooke.