The size of the Court is not specified; the Constitution leaves it to Congress to set the number of justices.

When the cases in volume 146 U.S. were decided the Court comprised the following nine members: McPherson v. Blacker, 146 U.S. 1 (1892), concerned a law passed in Michigan which divided the state into separate congressional districts and awarded one of the state's electoral votes to the winner of each district.

The suit was filed by several of these electors chosen in the 1892 election, including William McPherson, against Robert R. Blacker, the Secretary of State of Michigan.

It was the first Supreme Court case to consider whether certain methods of states' appointments of their electors were constitutional.

[2] The Court, in a majority opinion authored by Chief Justice Melville Fuller,[3] upheld Michigan's law, and more generally gave state legislatures plenary power over how they appointed their electors.