The maker of Sam Adams beer announced...it is withdrawing its sponsorship of Boston’s St. Patrick’s Day parade because organizers exclude gay groups. Boston Beer Co.’s decision came a day after a bar in Boston’s South End said it would no longer serve Sam Adams beer because of the brewer’s affiliation with the parade...A Boston Beer Co. spokeswoman did not immediately return a call...The parade, one of the largest St. Patrick’s Day parades in the nation, draws as many as 1 million spectators to South Boston.