Uruguay elects on national level a head of state - the president - and a legislature. The president and the vice-president are elected on one ballot for a five-year term by the people. The General Assembly (Asamblea General) has two chambers. The Chamber of Deputies (Cámara de Diputados) has 99 members, elected for a five-year term by proportional representation. The Chamber of Senators (Cámara de Senadores) has 31 members elected for a five-year term by proportional representation and the Vice-president. Uruguay has a multi-party system, with three dominant political parties, with extreme difficulty for anybody to achieve electoral success under the banner of any other party.