500k+ metros for Romney

[True Federalist (진정한 연방 주의자)]

I'm not sure where you got the results for Atlanta, but in the 29 county Atlanta MSA, I have the following results:

Obama: 1,096,628 (50.26%)
Romney: 1,057,819 (48.48%)

I think your numbers might also include the counties in the Atlanta Combined Statistical Area?

I was using a misleading wikipedia article Checked with the offical census website and I shouldn't have been including Hall County. I stand corrected. I'm not super familiar with the Atlanta area. On paper, it looks too far for commuters, but the growth out there is explosive. What gives?

For the large metro areas its a ripple effect.  If County B has a good number of commuters who work in County A, and County C has a good number of commuters who work in County B.  Then County A and County C can end up in the same statistical area even if Counties A and C have little to do with each other directly.