Article: Chile
Section: Government and politics

Question: Who were the top two candidates for the Chilean presidency in 2010?

The current Constitution of Chile was approved in a national plebiscite —regarded as "highly irregular" by some observers— in September 1980, under the military government of Augusto Pinochet.
It entered into force in March 1981.
After Pinochet's defeat in the 1988 plebiscite, the constitution was amended to ease provisions for future amendments to the Constitution.
In September 2005, President Ricardo Lagos signed into law several constitutional amendments passed by Congress.
These include eliminating the positions of appointed senators and senators for life, granting the President authority to remove the commanders-in-chief of the armed forces, and reducing the presidential term from six to four years.
The Congress of Chile has a 38-seat Senate and a 120-member Chamber of Deputies.
Senators serve for eight years with staggered terms, while deputies are elected every 4 years.
The current Senate has a 20–18 split in favor of the opposition coalition.
The last congressional elections were held on 13 December 2009, concurrently with the presidential election.
The current lower house-the Chamber of Deputies-contains 58 members of the governing center-right coalition, 54 from the center-left opposition and 8 from small parties or independents.
The Congress is located in the port city of Valparaíso, about west of the capital, Santiago.
Chile's congressional elections are governed by a binomial system that, for the most part, rewards the two largest representations equally, often regardless of their relative popular support.
Parties are thus forced to form wide coalitions and, historically, the two largest coalitions (Concertación and Alianza) split most of the seats.
Only if the leading coalition ticket out-polls the second place coalition by a margin of more than 2-to-1 does the winning coalition gain both seats, which tends to lock the legislative in a roughly 50-50 split.
Chile's judiciary is independent and includes a court of appeal, a system of military courts, a constitutional tribunal, and the Supreme Court of Chile.
In June 2005, Chile completed a nationwide overhaul of its criminal justice system.
The reform has replaced inquisitorial proceedings with an adversarial system more similar to that of the United States.
In the 2001 congressional elections, the conservative Independent Democratic Union (UDI) surpassed the Christian Democrats for the first time to become the largest party in the lower house.
In the 2005 parliamentary election, both leading parties, the Christian Democrats and the UDI lost representation in favor of their respective allies Socialist Party (which became the biggest party in the Concertación block) and National Renewal in the right-wing alliance.
In the last legislative elections in Chile, the Communist Party won 3 out of 120 seats in the Chamber of Deputies for the first time in 30 years (the Communist Party was not allowed to exist as such during the dictatorship).
Chileans voted in the first round of presidential elections on 13 December 2009.
None of the four presidential candidates got more than 50 percent of the vote.
As a result, the top two candidates, center-left Concertación de Partidos por la Democracia coalition's Eduardo Frei Ruiz-Tagle and center-right Coalición por el Cambio coalition's Sebastián Piñera, competed in a run-off election on 17 January 2010, which Piñera won.
This was Chile's fifth presidential election since the end of the Pinochet era.
All five have been judged free and fair.
The president is constitutionally barred from serving consecutive terms.