Article Two of the United States Constitution states that for a person to serve as president, the individual must be a natural-born citizen of the United States, be at least 35 years old, and have been a United States resident for at least 14 years. Candidates for the presidency typically seek the nomination of one of the various political parties of the United States, which is awarded through a process such as a primary election. The primary elections are usually indirect elections where voters cast ballots for a slate of party delegates pledged to a particular candidate.