4
ALEXANDER v. SOUTH CAROLINA STATE CONFERENCE
OF THE NAACP
Syllabus
of his three models failed to control for contiguity or compactness. Second, he used an inferior method of measuring a precinct’s partisan
leanings by counting absolute votes rather than a party’s relative
share of the vote. The report of Dr. Baodong Liu purported to show
that race rather than politics explains District 1’s design, but Dr. Liu’s
methodology was plainly flawed. Like Dr. Ragusa, Dr. Liu failed to
account for contiguity and compactness. And while this defect alone is
sufficient to preclude reliance, Dr. Liu also used inferior data to measure a district’s partisan tilt—i.e., data from the 2018 off-cycle gubernatorial primaries. Finally, the report of Dr. Moon Duchin, like that
of Dr. Imai, did not account for partisanship or core retention and was
based on an assessment of the map as a whole rather than District 1
in particular. Thus, her report has no probative force with respect to
the Challengers’ racial-gerrymandering claim regarding District 1’s
boundaries. Pp. 19–29.
(e) The District Court also critically erred by failing to draw an
adverse inference against the Challengers for not providing an adequate alternate map. By showing that a rational legislature, driven
only by its professed mapmaking criteria, could have produced a different map with “greater racial balance,” Cromartie, 532 U. S., at 258,
an alternative map can perform the critical task of distinguishing between racial and political motivations when race and partisanship are
closely entwined. Moreover, an alternative map is easy to produce.
The District Court mistakenly held that an alternative map is relevant
only for the purpose of showing that a remedy is plausible. A plaintiff’s
failure to submit an alternative map should be interpreted by courts
as an implicit concession that the plaintiff cannot draw a map that
undermines the legislature’s defense. Pp. 30–31.
2. Because the same findings of fact and reasoning that guided the
court’s racial-gerrymandering analysis also guided the analysis of the
Challengers’ independent vote-dilution claim, that conclusion also cannot stand. The District Court also erred in conflating the two claims.
A plaintiff pressing a vote-dilution claim cannot prevail simply by
showing that race played a predominant role in the districting process,
but rather must show that the State “enacted a particular voting
scheme as a purposeful device to minimize or cancel out the voting potential of racial or ethnic minorities.” Miller, 515 U. S., at 911. In
other words, the plaintiff must show that the State’s districting plan
“has the purpose and effect” of diluting the minority vote. Shaw v.
Reno, 509 U. S. 630, 649. In light of these two errors in the District
Court’s analysis, a remand is appropriate. Pp. 34–35.
Reversed in part and remanded in part.
ALITO, J., delivered the opinion of the Court, in which ROBERTS, C. J.,