18 years of age; universal and compulsory (but not enforced)
Executive branch:
chief of state: President Felipe de Jesus CALDERON Hinojosa (since 1 December 2006); note - the president is both the chief of state and head of government
head of government: President Felipe de Jesus CALDERON Hinojosa (since 1 December 2006)
cabinet: Cabinet appointed by the president; note - appointment of attorney general, the head of the Bank of Mexico, and senior treasury officials require consent of the Senate (For more information visit the World Leaders website ) elections: president elected by popular vote for a single six-year term; election last held on 2 July 2006 (next to be held 1 July 2012)
election results: Felipe CALDERON elected president; percent of vote - Felipe CALDERON 35.9%, Andres Manuel LOPEZ OBRADOR 35.3%, Roberto MADRAZO 22.3%, other 6.5%
Legislative branch:
bicameral National Congress or Congreso de la Union consists of the Senate or Camara de Senadores (128 seats; 96 members elected by popular vote to serve six-year terms, and 32 seats allocated on the basis of each party's popular vote) and the Chamber of Deputies or Camara de Diputados (500 seats; 300 members are elected by popular vote; remaining 200 members are allocated on the basis of each party's popular vote; members to serve three-year terms)
elections: Senate - last held on 2 July 2006 for all of the seats (next to be held on 1 July 2012); Chamber of Deputies - last held on 5 July 2009 (next to be held on 1 July 2012)
election results: Senate - percent of vote by party - NA; seats by party - PAN 52, PRI 33, PRD 26, PVEM 6, CD 5, PT 5, independent 1; Chamber of Deputies - percent of vote by party - NA; seats by party - PRI 237, PAN 143, PRD 72, PVEM 21, PT 13, CD 6, other 8; note - as of 1 January 2011, the current composition of the Senate is: PAN 50, PRI 33, PRD 25, PVEM 6, CD 6, PT 5, independent 3; the current composition of the Chamber of Deputies is: PRI 237, PAN 142, PRD 69, PVEM 21, PT 13, CD 8, other 10