20 RUCHO v. COMMON CAUSE Opinion of the Court number of seats for each party and determine at what point deviation from that balance went too far. If a 5–3 allocation corresponds most closely to statewide vote totals, is a 6–2 allocation permissible, given that legislatures have the authority to engage in a certain degree of partisan gerrymandering? Which seats should be packed and which cracked? Or if the goal is as many competitive districts as possible, how close does the split need to be for the district to be considered competitive? Presumably not all districts could qualify, so how to choose? Even assuming the court knew which version of fairness to be looking for, there are no discernible and manageable standards for deciding whether there has been a violation. The questions are “unguided and ill suited to the development of judicial standards,” Vieth, 541 U. S., at 296 (plurality opinion), and “results from one gerrymandering case to the next would likely be disparate and inconsistent,” id., at 308 (opinion of Kennedy, J.). Appellees contend that if we can adjudicate one-person, one-vote claims, we can also assess partisan gerrymandering claims. But the one-person, one-vote rule is relatively easy to administer as a matter of math. The same cannot be said of partisan gerrymandering claims, because the Constitution supplies no objective measure for assessing whether a districting map treats a political party fairly. It hardly follows from the principle that each person must have an equal say in the election of representatives that a person is entitled to have his political party achieve representation in some way commensurate to its share of statewide support. More fundamentally, “vote dilution” in the one-person, one-vote cases refers to the idea that each vote must carry equal weight. In other words, each representative must be accountable to (approximately) the same number of constituents. That requirement does not extend to political parties. It does not mean that each party must be influen-