The Twenty-third Amendment is ratified
The Twenty-third Amendment (Amendment XXIII) to the United States Constitution permits the District of Columbia to choose Electors for President and Vice President.
The amendment was proposed by Congress on June 17, 1960, and ratified by the states on March 29, 1961. The first Presidential election in which it was in effect was the presidential election of 1964.
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 twelfth article of amendment.
Section 2. The Congress shall have power to enforce this article using appropriate legislation.
”— 23rd Amendment to the United States Constitution