The Democratic National Convention (DNC) is a series of presidential nominating conventions held every four years since 1832 by the United States Democratic Party. They have been administered by the s the 1852 national convention. The primary goal of the Democratic National Convention is to nominate and confirm a candidate for president and vice president, adopt a comprehensive party platform and unify the party. Pledged delegates from all fifty U.S. states and from American dependencies and territories such as Puerto Rico and the Virgin Islands, and superdelegates which are unpledged delegates representing the Democratic establishment, attend the convention and cast their votes to choose the Party's presidential candidate. Like the Republican National Convention, the Democratic National Convention marks the formal end of the primary election period and the start of the general election season.
The party's presidential nominee is chosen in a series of individual state caucuses and primary elections. Superdelegates, delegates whose votes are not bound to the outcome of a state's caucus or primary, may also influence the nomination. To secure the nomination for the Democratic party in 2016, a candidate must secure 2,383 delegates. This number includes both pledged delegates and superdelegates.
Prior to 1936, nomination for president was required, not merely by a majority, but by two-thirds of the total number of delegates. Unless there was a popular incumbent, something that only happened three times between the Civil War and World War II, getting that many votes on the first ballot was implausible. The choice was an often contentious debate that riled the passions of party leaders. Delegates were forced to vote for a nominee repeatedly until someone could capture a minimum number of delegates needed. In 1912, 1920 and most notoriously in 1924, the voting went on for dozens and dozens of ballots.