On Saturday in Copenhagen, Canada's General Jennie Carignan will stand for election to NATO's highest military office — a role only three Canadians have ever held — knowing that the most powerful voice in the room has already spoken for someone else. The United States, whose weight in alliance decisions remains decisive, is backing Germany's General Carsten Breuer, a reflection less of Carignan's qualifications than of shifting strategic priorities and, some suggest, an American political culture resistant to women in senior command. Ottawa has campaigned earnestly across Europe, and Carignan'