Cite as: 602 U. S. ____ (2024) 21 Opinion of the Court The Challengers seek to excuse their failures to disentangle race and politics by arguing that South Carolina raised a partisan-gerrymandering defense for the first time during the trial, but this argument rests on the implausible premise that the Challengers were unaware of the legislature’s partisan concerns during the mapmaking process. The fact of the matter is that politics pervaded the highly visible mapmaking process from start to finish. The Republican and Democratic caucuses submitted competing maps, and the Enacted Plan passed the legislature by a margin of 26 to 15 in the Senate and 72 to 33 in the House, with only Democrats voting in opposition. The public hearings and legislative debates are of a piece. For example, Senator Margie Bright Matthews, a black Democrat, said in a floor debate with Senator Campsen that “ ‘we’re not going to get into the racial gerrymandering thing because you and I both know in Charleston it matters not about your race. It is just that you went by how those folks voted.’ ” App. 296. For evidence, she recognized that the Enacted Plan also moved into District 6 predominantly white parts of Charleston that skewed Democratic, such as West Ashley. She added, “ ‘Senator [Campsen], . . . I really appreciate you agreeing with me that our opposition . . . is not about racial [gerrymandering].’ ” Ibid. Instead, she said, it was about “ ‘packing’ ” the Democratic-voting area of Charleston into District 6 “ ‘to make [District 1] more electable.’ ” Ibid. Former Congressman Cunningham, the Democrat who represented District 1 from 2018 to 2020, also criticized the Enacted Plan’s District 1 lines as “ ‘mak[ing] no sense unless, of course, the sole purpose . . . is to make it harder for a Republican to lose.’ ” Id., at 295. He added that “the folks in Washington, D.C.,” did not want a repeat of the 2018 election or even the 2020 election where he lost against the Republican nominee by “a single point in one of the closest elections in the entire country.” Ibid. Under these circumstances, it is safe to say that the Challengers were on notice

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