Is it too early to talk about the foreign policy and national security agenda that will face the next president? No matter who wins on November 6, the feature that is going to dominate U.S. national security planning over the next four years is constraint. Even if we avoid going off the sequestration cliff, there is going to be considerable pressure on the defense budget. Forget all those promises that Romney made about ramping up defense spending, expanding the Navy, etc. If he does beat Obama and has to face reality (as opposed to his Etch-a-Sketch approach to campaigning) he'll figure out that budget math is real and unforgiving. And given the budget picture these days, that means limits.