Notice the third column for Race on the Clout List (pdf file)? It's W's, B's, H's, and a few O's.
My experience working with race indicators is the results are vastly different if Race is self reported versus someone else reporting. Self reported results yield far more blanks or unknowns. A few blanks on this list and not a single U from my scan.
I don't think they were using the data for affirmative action reports so it would be interesting to see what in the world they did do with it; and who was deciding what Race everyone belonged too.
I thought -if I was using this list- I would have been more interested in the person's precinct of residence, but that may have turned out to be as flakey as the flakey biology of race.
cross posted at Illinoize