Baker v. Carr
Baker v. Carr, 269 U.S. 186 (1962) is notable mostly for Justice William Brennan's discussion of the political question doctrine. In a 6-2 decision, the Court held that the apportionment of state legislative districts is not a political question and can be reviewed by the courts if constitutional violations are alleged. Together with Reynolds v. Sims, 377 U.S. 533 (1964), this decision created the "One man, one vote" requirement for state legislative apportionment.
- Case at FindLaw