Guarantee Clause

Article IV, section 4 of the Constitution reads: “The United States shall guarantee to every State in this Union a Republican Form of Government.” By inserting these words in the Constitution, the framers, fearful of aristocratic or mobocratic threats to representative government, sought to preserve republican ideals and institutions in the states.4

The Supreme Court's first major interpretation of the Guarantee Clause emerged out of the Dorr Rebellion, in which Thomas Dorr and his followers challenged the legitimacy of the established government of Rhode Island. In Luther v. Borden (1849), Chief Justice Roger B. Taney held that the power to assess either the legitimacy or the republican character of a state government rested with Congress, not the courts. Such questions, he argued, were “political” in nature and thus lay beyond the scope of the Court's power (see Political Questions). Taney's reluctance to assert judicial power in Luther affected the constitutional development of the Guarantee Clause for the next century. During the Reconstruction period, for example, Republicans in Congress understood this interpretation of the clause to acknowledge congressional authority to prescribe the terms of Reconstruction.

Not until the reapportionment controversies of the 1960s did the Guarantee Clause again emerge at the center of constitutional debate (see Reapportionment Cases). In Baker v. Carr (1962), proponents of reapportionment argued that it was the duty of the courts to guarantee republican governments in the states by invalidating legislative malapportionment. The Supreme Court, however, avoided a reinterpretation of the Guarantee Clause and instead decided that malapportionment violated the Equal Protection Clause. Although the justices did not overturn Taney's decision that Guarantee Clause cases presented nonjusticiable political questions, the Court nevertheless narrowed the number of cases they would exclude from their jurisdiction under the political question doctrine.

See also Judicial Power and Jurisdiction.

— William M. Wiecek

Art. IV, Sec. 4 of the United States Constitution, which states that "the United States shall guarantee to every state in this Union a Republican Form of Government." That section of the Constitution has been held to provide that the United States "shall protect each of them [the states] against invasion; and on the application of the legislature or of the executive (when the legislature cannot be convened) against domestic violence." 48 U.S. 1, 42. The Court has declined to use the clause to identify a state's lawful government, 7 How. 1, or to enforce a representative form of government, Baker v. Carr, 369 U.S. 186; but has instead used the equal protection clause of the Constitution to achieve legislative apportionment of a representative character and thus invalidate some forms of gerrymandering. Id.; 377 U.S. 533.