Cite as: 588 U. S. ____ (2019) 25 KAGAN, J., dissenting ideal of proportional representation commanded another Republican seat. It invalidated that district because the quest for partisan gain made the State override its own political geography and districting criteria. So much, then, for the impossibility of neutrality. The majority’s sole response misses the point. According to the majority, “it does not make sense to use” a State’s own (non-partisan) districting criteria as the baseline from which to measure partisan gerrymandering because those criteria “will vary from State to State and year to year.” Ante, at 27. But that is a virtue, not a vice—a feature, not a bug. Using the criteria the State itself has chosen at the relevant time prevents any judicial predilections from affecting the analysis—exactly what the majority claims it wants. At the same time, using those criteria enables a court to measure just what it should: the extent to which the pursuit of partisan advantage—by these legislators at this moment—has distorted the State’s districting decisions. Sure, different non-partisan criteria could result, as the majority notes, in different partisan distributions to serve as the baseline. Ante, at 28. But that in itself raises no issue: Everyone agrees that state officials using non-partisan criteria (e.g., must counties be kept together? should districts be compact?) have wide latitude in districting. The problem arises only when legislators or mapmakers substantially deviate from the baseline distribution by manipulating district lines for partisan gain. So once again, the majority’s analysis falters because it equates the demand to eliminate partisan gerrymandering with a demand for a single partisan distribution—the one reflecting proportional representation. See ante, at 16–17. But those two demands are different, and only the former is at issue here. The majority’s “how much is too much” critique fares no better than its neutrality argument. How about the following for a first-cut answer: This much is too much. By

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