William "Mo" Cowan, left, smiles as he is introduced by Mass. Gov. Deval Patrick during a news conference where he was named interim U.S. Senator for the seat vacated by U.S. Sen. John Kerry, D-Mass., at the Statehouse in Boston, Wednesday, Jan. 30, 2013. Kerry was confirmed by the Senate on Tuesday to be the nation's next secretary of state. (AP Photo/Charles Krupa)
U.S. Sen. John Kerry greets William “Mo” Cowan before addressing constituents at Faneuil Hall in Boston last Thursday. Kerry is leaving to serve as secretary of state, and Cowan will occupy his Senate seat temporarily.