16 CHIAFALO v. WASHINGTON Opinion of the Court Rawle explained how the Electoral College functioned: “[T]he electors do not assemble in their several states for a free exercise of their own judgments, but for the purpose of electing” the nominee of “the predominant political party which has chosen those electors.” A View of the Constitution of the United States of America 57 (2d ed. 1829). Looking back at the close of the century, this Court had no doubt that Story’s and Rawle’s descriptions were right. The electors, the Court noted, were chosen “simply to register the will of the appointing power in respect of a particular candidate.” McPherson, 146 U. S., at 36. State election laws evolved to reinforce that development, ensuring that a State’s electors would vote the same way as its citizens. As noted earlier, state legislatures early dropped out of the picture; by the mid-1800s, ordinary voters chose electors. See supra, at 4. Except that increasingly, they did not do so directly. States listed only presidential candidates on the ballot, on the understanding that electors would do no more than vote for the winner. Usually, the State could ensure that result by appointing electors chosen by the winner’s party. But to remove any doubt, States began in the early 1900s to enact statutes requiring electors to pledge that they would squelch any urge to break ranks with voters. See supra, at 5. Washington’s law, penalizing a pledge’s breach, is only another in the same vein. It reflects a tradition more than two centuries old. In that practice, electors are not free agents; they are to vote for the candidate whom the State’s voters have chosen. The history going the opposite way is one of anomalies only. The Electors stress that since the founding, electors have cast some 180 faithless votes for either President or Vice President. See Brief for Petitioners 7. But that is 180 out of over 23,000. See Brief for Republican National Committee as Amicus Curiae 19. And more than a third of the faithless votes come from 1872, when the Democratic Party’s nominee (Horace Greeley) died just after Election