Twenty-third Amendment to the United States Constitution
According to the terms of the amendment, the district is allocated as many electors as it would have if it were a state, but no more electors than the least populous state (currently Wyoming, which has three electors); thus, the district cannot have more than three electors. Even if it were a state, the district's population would entitle it to only three electors.  Since the passage of this amendment, the District's electoral votes have been cast for the Democratic Party's presidential and vice presidential candidates in every election.