Mass. AG Wins Dem Primary to Fill Ted Kennedy's Seat Jan. 19 election next for Martha Coakley By Newser Editors and Wire Services Posted Dec 8, 2009 8:06 PM CST 10 comments Comments Mass. Attorney General Martha Coakley won today's Democratic primary and will run to fill Edward Kennedy's vacant seat. (AP Photo) (Newser) – Massachusetts Attorney General Martha Coakley has defeated three other candidates to win the Democratic nomination in the race to succeed the late Sen. Edward Kennedy. The 56-year-old Coakley is vying to be the first woman elected to the U.S. Senate from Massachusetts. She defeated Rep. Michael Capuano, City Year co-founder Alan Khazei and Boston Celtics co-owner Stephen Pagliuca. She'll face Republican State Sen. Scott Brown in a general election Jan. 19.