Political parties are collective entities that organize competitions for political offices. The members of a political party contest elections under a shared label. In a narrow definition, a political party can be thought of as just the group of candidates who run for office under a party label. In a broader definition, political parties are the entire apparatus that supports the election of a group of candidates, including voters and volunteers who identify with a particular political party, the official party organizations that support the election of that party's candidates, and legislators in the government who are affiliated with the party.