William "Mo" Cowan smiles Jan. 30, 2013, during a news conference at the Statehouse in Boston where he was selected to fill John F. Kerry's seat on an interim basis in the Senate. Kerry was confirmed by the Senate the previous day to be the nation's next secretary of state. (Associated Press

Photo by: Charles Krupa

William "Mo" Cowan smiles Jan. 30, 2013, during a news conference at the Statehouse in Boston where he was selected to fill John F. Kerry's seat on an interim basis in the Senate. Kerry was confirmed by the Senate the previous day to be the nation's next secretary of state. (Associated Press