Twenty-third Amendment to the United States Constitution
While the District of Columbia is considered politically neutral at the time of passage in 1961, the District swung dramatically toward the Democratic Party since. African-Americans have voted in greater numbers than they had in the 1940s and 1950s. According to the 1970 census, 71% of the Federal District was black, a dramatic jump. As a result, the District has sent its 3 electoral votes to the Democratic candidate in every single presidential election since 1964. However, the District's electoral votes have yet to prove decisive in a presidential election. The smallest Electoral College majority won by a Democratic president since the Twenty-third Amendment's ratification was the 56 vote majority achieved by Jimmy Carter in 1976.