Establishes that the vice president is elected together with the president rather than as the runner-up in the presidential election. Proposed December 9, 1803; ratified June 15, 1804, 6 months later. The Twelfth Amendment to the United States Constitution provides the procedure for electing the president and vice president. It replaced the procedure in Article II, Section 1, Clause 3, under which the Electoral College originally functioned. The amendment was proposed by Congress on December 9, 1803, and was ratified by the requisite three-quarters of state legislatures on June 15, 1804. The new rules took effect for the 1804 presidential election and have governed all subsequent presidential elections. Wiki link