Every U.S. state has a committee to oversee local issues surrounding a political party. The activities for the state parties include coordinating campaigns, overseeing local conventions and sometimes running primaries and caucuses.
The larger independent parties, such as the Constitution Party, Libertarian Party and Green Party, have a state organization to deal with similar issues. Due to their lack of a national structure, however, they have more influence over the party’s candidate selection and agenda. It is not unusual for smaller independent parties to run for office in just one state.