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6 The unambiguous meaning of “the Legislature” in the Elections Clause as a representative body is confirmed by other provisions of the Constitution that use the same term in the same way. When seeking to discern the meaning of a word in the Constitution, there is no better dictionary than the rest of the Constitution itself. Our precedents new and old have employed this structural method of interpretation to read the Constitution in the manner it was drafted and ratified—as a unified, coherent whole. See, e.g., NLRB v. Noel Canning, 573 U. S. ___, ___–___ (2014) (slip op., at 19–20); id., at ___ (, J., concurring in judgment) (slip op., at 32); McCulloch v. Maryland, 4 Wheat. 316, 414–415 (1819); Martin v. Hunter’s Lessee, 1 Wheat. 304, 328–330 (1816); Amar, Intratextualism, 112 Harv. L. Rev. 747 (1999).

The Constitution includes seventeen provisions referring to a State’s “Legislature.” See, infra. Every one of those references is consistent with the understanding of a legislature as a representative body. More importantly, many of them are only consistent with an institutional legislature—and flatly incompatible with the majority’s reading of “the Legislature” to refer to the people as a whole.

Start with the Constitution’s first use of the term: “The House of Representatives shall be composed of Members chosen every second Year by the People of the several States, and the Electors in each State shall have the Qualifications requisite for Electors of the most numerous Branch of the State Legislature.” Art. I, §2, cl. 1. This reference to a “Branch of the State Legislature” can only be referring to an institutional body, and the explicit juxtaposition of “the State Legislature” with “the People of the several States” forecloses the majority’s proposed reading.

The next Section of Article I describes how to fill