Watch: Democratic Candidates For Senate, As Seen On TV

All four Democratic candidates running to fill Edward M. Kennedy's Senate seat are now advertising on television.

City Year co-founder Alan Khazei's commercials began running Thursday and Attorney General Martha Coakley started advertising earlier this week. The campaigns of U.S. Rep. Michael Capuano and Boston Celtics co-owner Stephen Pagliuca have been broadcasting for the past month.

Watch the ads after the jump.

Alan Khazei

Rep. Michael Capuano

Stephen Pagliuca

Martha Coakley