President Obama’s stewardship of the national security portfolio to date amounts to a wrecking operation, a set of policies he must understand will not only weaken the United States but embolden our foes. After all, the Communist agitator Saul Alinsky, a formative influence in Mr. Obama’s early years as a “community organizer,” made Rule Number One in his 1971 book Rules for Radicals: “Power is not only what you have but what the enemy thinks you have.”