28 ALEXANDER v. SOUTH CAROLINA STATE CONFERENCE OF THE NAACP Opinion of the Court neighbors were moved too. This defect alone is sufficient to preclude reliance on Dr. Liu’s report, but that report exhibited another flaw: it used inferior data to measure a district’s partisan tilt. While the State used voting data from the 2020 Presidential election, Dr. Liu relied on data from the 2018 gubernatorial primaries. Data from that gubernatorial primary is less informative because far fewer voters turn out for off-cycle gubernatorial primary elections. The numbers prove the point. In the 2018 elections, a total of about 610,000 votes were cast across both primaries; in the 2020 Presidential election, by contrast, a total of 2.5 million votes were cast. 10 Because Dr. Liu examined only a small, highly non-random sample of the regular voting electorate, we cannot say that the same results would hold true if he had applied his methodology to the State’s 2020 data. Dr. Moon Duchin. Dr. Moon Duchin, the final expert put forward by the Challengers, provided a report assessing whether the Enacted Plan “cracks” black voters among multiple districts in a way that produced “discernible vote dilution.” J. S. A. Supp. 127a. After finding that the Enacted Plan diluted the black vote, Dr. Duchin concluded that it is “not plausible” that the dilution was a mere “side effect of partisan concerns.” Id., at 175a. Neither the District Court nor the Challengers cite Dr. Duchin’s report to support the racial-predominance finding, and that is for a good reason. Like Dr. Imai’s report, various parts of Dr. Duchin’s report did not account for partisanship or core retention. App. 102–103. Moreover, Dr. —————— 10 See N. Y. Times, South Carolina Governor Primary Election Results (Nov. 3, 2020), https://www.nytimes.com/elections/results/south-carolinagovernor-primary-election; N. Y. Times, South Carolina Presidential Election Results (Nov. 3, 2020), https://www.nytimes.com/interactive/ 2020/11/03/us/elections/results-south-carolina-president.html; see also App. 135 (testimony of Baodong Liu) (noting that Presidential election years “usually ha[ve] a very high level of voter turnout”).

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