I don't think this will change any minds. Both of them did well so far as presentation went.
McCain said something immensely silly: that Ukraine and Georgia ought to be admitted to NATO. No, they should not: both, especially Georgia is a huge liability, neither of them would make NATO stronger in any way.
Not bright, not realistic, not our sphere of influence, and sure as Hell not now. It's not time to kick the Russians in the nuts.
Neither of them was very useful in discussing the Wall Street bailout.
Obama beat McCain on a number of specific points, none of them well known enough to most Americans, who know nothing about Spain or its leaders, just to name one.