"In this book, Peter Beinart offers a new liberal vision, based on principles liberals too often forget: That America's greatness cannot simply be asserted; it must be proved. That to be good, America does not have to be pure. That American leadership is not American empire. And that liberalism cannot merely define itself against the right, but must fervently oppose the totalitarianism that blighted Europe a half a century ago, and which stalks the...