Three negative reasons, one positive, to believe that Barack Obama's victory will advance America's interests, and that John McCain's would be severely damaging:
Negative 1: Accountability. There have been minor positive aspects to the eight-year Bush-Cheney era now coming to an end. But when the diplomatic, fiscal, Constitutional, economic, and other civic consequences are viewed as a whole, this era has, in my view, been a disaster for the United States.
And evidently this assessment of our recent history is not just my view. That is what the record-low approval ratings for President Bush, and the record-high "wrong track" poll readings indicate. For America to return the incumbent party to power after this record would make a mockery of the idea of ballot-box accountability and two-party competition. If an incumbent party retains power after this record, what is the meaning of party competition at all?
I have spent a lot of time as an American overseas, starting in the bitter Nixon years of the early 1970s. Never has the "brand identity" of being an American suffered as much as it has under George W. Bush. Any American business person operating overseas will confirm this fact.