A member of the president’s National Security Council who shares Noam Chomsky’s foreign-policy goals? An influential presidential adviser whom 1960s revolutionary Tom Hayden treats as a fellow radical? ... Samantha Power, senior director of multilateral affairs for the National Security Council and perhaps the principal architect of our current intervention in Libya, is all of these things. These scary-sounding tidbits might be dismissed as isolated “gotchas.” Unfortunately, when we view these radical outcroppings in the full sweep of her life’s work, Samantha Power emerges as a patriot’s nightmare — a woman determined to subordinate America’s national sovereignty to an international...