Presumably this means that Ferguson is reasonably comfortable with Obama's foreign policy views. Given Niall's own positions, one might think this likely to disconcert some of Obama's more "progressive" supporters while, of course, also confirming the paleocon view that there's much less between the candidates' foreign policy "vision" (which is not to be confused with jjudgement and temperament) than is generally thought the case.
Then again, Niall likes to think of himself as a 19th - or 18th - century liberal, so it's no great surprise that he doesn't have an obvious home in either party at present. Of course, Colossus argued that, in the end, the United States didn't have the stomach to do empire properly. I don't suspect he really thinks this will change under Obama, but, rather, Obama's upside is greater than McCain's and his downside, in foreign policy terms at least, no lower.