David D. Friedman & his readers suggest some things Obama can do get libertarian Republicans to vote for him (“Thoughts for Obama“):
“[A] possibility that occurs to me is to take advantage of the budgetary implications of Obama’s opposition to the Iraq War. If the U.S. pulls out, we will get a ‘peace dividend’ — a whole lot of money now being spent on the war will be available for other purposes. No doubt lots of people, in both parties, will have ideas for ways of spending it.
“Suppose Obama commits himself not to let the peace dividend be spent on new projects, or at least not all of it. Suppose, for instance, that he promises that at least half of the saving will be used to reduce the budget deficit. That puts him in the position of the fiscally responsible candidate, which should appeal to conservatives as well as libertarians. And it is a pledge that McCain cannot match, since he supports the war and so is not going to have any peace dividend to allocate. …”