BayToBay
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A computer program can sort people into racial groups by analyzing genetic material and these groups have near perfect overlap with the social meaning of race.
For each person in the study, the researchers examined 326 DNA regions that tend to vary between people. These regions are not necessarily within genes, but are simply genetic signposts on chromosomes that come in a variety of different forms at the same location.
Without knowing how the participants had identified themselves, Risch and his team ran the results through a computer program that grouped individuals according to patterns of the 326 signposts. This analysis could have resulted in any number of different clusters, but only four clear groups turned up. And in each case the individuals within those clusters all fell within the same self-identified racial group.
"This shows that people's self-identified race/ethnicity is a nearly perfect indicator of their genetic background," Risch said.
And what did the program say Obama was?
I am a programmer. Any program I write to sort things is going to sort them based on the definition of the categories I code. Of course, i would use the social meanings of the categories. That does not make the categories real in any way other than within the system that I had devised.