Mo Cowan, U.S. Senator

https://en.wikipedia.org/wiki/Mo_Cowan

William (Mo) Cowan, a Senator from Massachusetts; born in Yadkinville, N. C., April 4, 1969; graduated Duke University, A.B., 1991; graduated Northeastern University School of Law, J.D., 1994; law partner; legal counsel and chief of staff to Massachusetts Governor Deval Patrick 2009-2012; appointed as a Democrat to the United States Senate on February 1, 2013, to fill the vacancy caused by the resignation of John F. Kerry, and served until July 15, 2013, a successor having been chosen in a special election; not a candidate for election to the unexpired portion of the term.

http://bioguide.congress.gov/scripts/biodisplay.pl?index=C001099