The White vote went from 58% in 2004 for Republican to 55% in 2008. In other word the democrats went from 16% deficit among White voters in 2004 to a 10% deficit. Based on 75% of the electorate being White this represent a 4.5% shift in the total vote in favor of the democrat.
In the midst of our recent troubles, Conservatives have forgotten what a terrible candidate McCain was even with Palin and what huge advantage with the MSM/$$$/BDS which Obama had...McCain actually was a lot closer than I expected.
IMO, Obama will be a lot less formidable in 2012, assuming he is able to defeat Hillary again for the nomination.