Today marks the ratification of the 23rd Amendment to the U.S. Constitution in 1961, giving the District of Columbia representation in the electoral college for selecting the President and Vice-President. Prior to the passage of the Amendment, residents of the District had no representation in the electoral college and effectively no participation in voting in a Presidential election. The first election in which the District participated was in 1964.
Check out our collection to learn more about the changes and reforms to the electoral college. See, for example, Taming the Electoral College, by Robert W. Bennett, or The Electoral College Reform: Challenges and Possibilities, by Gary Bugh.