U.S. Rep. Seth Moulton, D-Mass., center without hat, marches with members of OutVets, a group of gay military veterans, during the St. Patrick's Day parade, Sunday, March 15, 2015, in Boston's South Boston neighborhood. Until now, gay rights groups have been barred by the South Boston Allied War Veterans Council from marching in the parade, which draws as many as a million spectators each year. (AP Photo/Steven Senne)