Cite as: 602 U. S. ____ (2024)
27
KAGAN, J., dissenting
were more likely than White voters to be removed from District 1. 7
Dr. Jordan Ragusa’s regression found that race, separate
and apart from partisanship, was “an important factor in
the design of the 1st district.” J. S. A. 509a; see 649
F. Supp. 3d, at 192. Ragusa looked at the size, racial demographics, and partisan composition of each precinct in
the old District 1. (His measure of partisanship was the
vote count for then-candidate Biden in the 2020 election,
which mirrored the political data the State’s mapmakers
possessed.) By controlling for all three of those variables,
Ragusa explained, he could “statistically disentangle the effect of each factor.” J. S. A. 505a. And when he did so, Ragusa determined that “the decision to move a [precinct] out
of [District 1] was highly correlated to the number of African American voters” in the precinct. 649 F. Supp. 3d, at
192; see J. S. A. 508a–509a, 514a. If, for example, a precinct had 100 to 500 Black voters, “the chance of [its] being
moved out” of District 1 was “no greater than 20%.” 649
F. Supp. 3d, at 192. But as the number climbed, so did the
likelihood: When a district had 1,500 Black voters, the probability of exclusion reached 60%. See ibid. And on top of
that analysis, Ragusa directly compared the effects of partisanship and race on the exclusion decision. He found that
the mapmakers removed 41% of precincts with more than
1,000 Biden voters, but 62% of precincts with more than
1,000 Black voters. See J. S. A. Supp. 14a. That comparison showed that “the racial composition of a precinct was a
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7 Two other studies on which the majority expends much effort, see
ante, at 19–22, 28–29, had only a tenuous connection to the race-versuspolitics question. Dr. Moon Duchin’s analysis was offered primarily to
support the Challengers’ independent vote-dilution claim. And Dr.
Kosuke Imai’s report was designed to address a different defense the
State could have raised—that traditional districting principles accounted for District 1’s lines. Those two studies are therefore irrelevant.
They do not help the Challengers on the disputed issue. But neither does
the majority score any points for saying as much.