The Democratic party has attempted to assure many special-interest groups representation at its national convention, although lately the party has moved away from this commitment. A political party organization created or sponsored by another organization. This form of local party organization is rare in the United States. Such representation was provided for by a recent party reform to ensure that an electable presidential candidate is selected. An electoral system with two dominant parties that compete in state or national elections.
Third parties have little chance of winning.
An element of the electoral system used in the United States which requires that only one member of the House of Representatives can be elected from each congressional district.