Though it is the home of the President of the United States those who resided there had no say in who occupied that big white house on Pennsylvania Avenue.
It was the 23rd Amendment passed in 1961 that allowed residents of the District of Columbia to vote in their first presidential election in 1964.
It was between Democrat Lyndon Johnson and Republican Barry Goldwater. DC aided in the landslide victory.

Who won that election?

Question:
DC residents first voted for president in 1964, who was elected president in that election?

Answer:
Lyndon Johnson

Winner:
Gilbert Harris
Portsmouth, OH