The federal Congress, as well as the state legislatures, are elected by a system of parallel voting that includes plurality and proportional representation. The Chamber of Deputies has 500 deputies. Of these, 300 are elected by plurality vote in single-member districts (the federal electoral districts) and 200 are elected by proportional representation with closed party lists for which the country is divided into five electoral constituencies. The Senate is made up of 128 senators. Of these, 64 senators (two for each state and two for Mexico City) are elected by plurality vote in pairs; 32 senators are the first minority or first-runner up (one for each state and one for Mexico City), and 32 are elected by proportional representation from national closed party lists.