8 ALEXANDER v. SOUTH CAROLINA STATE CONFERENCE OF THE NAACP THOMAS, J., concurring in part equipped to evaluate whether plaintiffs succeed in disentangling race and politics. As the Court observes, roughly 90% of black voters in South Carolina supported the Democratic candidate in the last Presidential election. Ante, at 4, and n. 2. When nearly all black voters support Democrats, an effort to strategically sort Democratic voters can be indistinguishable from an effort to strategically sort black voters. In this case, all Democratic-leaning maps presented during the districting process featured a black share of the voting-age population of 21% or higher, and all Republican-leaning maps featured a black voter share of 17% or lower. Ante, at 15. The dispute in this case therefore focuses on whether that correlation reflected a racial purpose, or merely reflected the result of a political purpose. The majority’s reasoning highlights the difficulties inherent in disentangling race and politics. Its explanation of why the expert evidence was insufficient does not rest on the application of legal principles, but on the likely errors it finds in the experts’ statistical models after a “foray into the minutiae of the record.” Cromartie, 532 U. S., at 262 (opinion of THOMAS, J.). The majority discounts four separate expert reports based on methodological concerns. One report is insufficient because it fails to model partisanship. Ante, at 19–21. Another “carries less weight” because it measures partisanship through the wrong statistical method. Ante, at 25. And, another cannot be relied upon because it measures partisanship with the wrong election data. Ante, at 26–27. The dissent accuses the Court of “play[ing] armchair statistician.” Post, at 31 (opinion of KAGAN, J.). But, the dissent’s defense of the expert reports includes an exercise in armchair cartography. The dissent justifies the experts’ assumption that the legislature could move any precinct in District 1 to District 6 by explaining that District 1 is thin, coastal, and shares a long border with District 6. Post, at 28–30. It supports its hunch with two

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