I'm not under the impression that the south as a whole is racist. However there are a lot of racists in the south.
Back in 2008 the republican brand was in the toilet. Iraq, Katrina and a whole bunch of scandals had left Bush and Cheney and the GOP with historical low approval ratings and historically high disapproval ratings. And then to top it off their eight year abdication of any regulation or oversight of the financial industry resulted in the biggest financial crash since 1929.
As this map of the country shows, it was impossible for the GOP facing those kind of headwinds to get more votes in districts/states in 2008 than they had done in 2004. Apart from a large swathe of the south and Appalachia where somehow they improved on the 2004 showing:
Blue is where Obama did better than Kerry. Red is where he did worse.
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