Barack Obama lost the state of South Carolina in 2008, by a wide margin, to John McCain, about 1.03M to 862K votes. It's a very simple process to show that Barack Obama, although he lost in SC, benefited from disproportionate support from the black population.
It goes like this: some counties in SC have as little as 8.6% non-white (mostly black) registered voters, while others have as great as 71%. There's a simple statistical test (called a Pearson test) which takes two columns of numbers and determines if they are likely to be corrlelated (or, rather, if they are unlikely to be uncorrelated, which is almost the same thing).
So I checked this for the Presidential General Election of 2008 in South Carolina, and find Obama received disproportionate support from non-white voters (surprising, probably, nobody). But I also checked this, for the Democratic Primary Election of 2010 in South Carolina, where Alvin Greene inexplicably and unexpectedly won. And guess what the results show?
Analysis after the jump.
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