I’m not sure “exposed” is the adjective I’d use, and I didn’t mean to suggest that “nation building” is necessarily a bad policy. But clearly Obama wanted tonight’s speech to remind voters that he authorized the killing of Obama, and that Romney had – in the White House retelling – cast doubt on the utility of focusing resources on this particular mission. In terms of the larger electoral picture, however, I think the economy is likely to have a bigger impact on the presidential vote than will debates over nation building.