Section 1. The District constituting the seat of Government of the United States shall appoint in such manner as the Congress may direct:
A number of electors of President and Vice President equal to the whole number of Senators and Representatives in Congress to which the District would be entitled if it were a State, but in no event more than the least populous State; they shall be in addition to those appointed by the States, but they shall be considered, for the purposes of the election of President and Vice President, to be electors appointed by a State; and they shall meet in the District and perform such duties as provided by the twelth article of amendment.
Section 2. The Congress shall have power to enforce this article by appropriate legislation.
This established representation of Washington, DC in the Electoral College for presidential elections. Passed by Congress in 1960, this was ratified in 1961.