It's a subject that continues to provoke and fascinate Canadians, and pre-eminent political commentator Jeffrey Simpson has his finger on its pulse.Is there really a "brain drain" from Canada to the US? Why do some Canadians want to live south of the border? Who are they? What have they found? Star-Spangled Canadians delivers some startling answers about the almost 700,000 ex-pat Canadians living in the US.He has talked to more than 200 of them, from...