The politician who defeated Vincent C. Gray in the primary of 2014 previously served which ward?
Vincent C. Gray:  He served one term, from 2011 to 2015, losing his bid for reelection in the Democratic primary to D.C. City Council member Muriel Bowser. Muriel Bowser:  Prior to her inauguration in January 2015, Bowser served as a member of the Council of the District of Columbia, representing Ward 4.
Ward 4