One of the best moments in the debate at Tampa came after a break, when Brian Williams of NBC turned to Senator Santorum and said he wanted to get him in on the question of Iran. “Specifically, as a last resort, as you said, taking out Iran’s nuclear program,” the moderator said. “The problem with that, so many in the military tell you, is the target list. Where do you limit it — the air strikes that some estimate would begin at 30 to 60 days sustained, taking out air defenses, all of that familiar language the American people have just been through for a decade?”