Power, not anchored to any larger principles, is a recipe for self-preservation over good governance. That's the picture that veteran Nevada political journalist Jon Ralston paints of the late former Senate majority leader Harry Reid and his worldview, in a meticulously reported if largely solicitous book about Reid's political life, The Game Changer . The subtitle of Ralston's book is: "How Harry Reid Remade the Rules and Showed Democrats How to Fight." That is, indeed, Reid's legacy. Growing