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| Electoral system of Chile (binomial) | |
|---|---|
| Name | Binomial electoral system of Chile |
| Type | Electoral system |
| Introduced | 1989 |
| Replaced | 2015–2017 |
| Used for | Chamber of Deputies of Chile and Senate of Chile elections |
| Ballot | Closed list |
| Seats | Two-member districts |
| Key feature | Overrepresentation of second-placed coalitions |
Electoral system of Chile (binomial) began as the defining method for legislative elections in Chile after the Chilean transition to democracy. It allocated two seats per electoral district and produced outcomes that favored large coalitions such as the Concertación and the Alianza por Chile. The system shaped political careers of figures like Patricio Aylwin, Eduardo Frei Ruiz-Tagle, Sebastián Piñera, Ricardo Lagos, and institutions including the National Congress of Chile and the Servicio Electoral de Chile.
The binomial system traces origins to electoral engineering during the Military dictatorship of Chile (1973–1990) under Augusto Pinochet when the Constitution of Chile (1980) and subsequent reforms sought to limit the speed of partisan change; designers included advisors linked to the Pinochet regime and technocrats who studied systems used in France and Italy. Early post-dictatorship debates involved the Pact of Moncloa-era accords and the negotiations that created the Concertación de Partidos por la Democracia coalition led by Patricio Aylwin. The 1989 elections under the binomial rules set precedents affecting the Municipal elections in Chile, Presidential election, Chile, 1989, and the profiles of leaders like Camilo Escalona and Arturo Frei.
Under the binomial design each electoral district returned two members to the Chamber of Deputies of Chile or two senators to the Senate of Chile (in many cases using multi-member senatorial constituencies), with ballots typically employing closed party lists managed by the Servel (Servicio Electoral de Chile). The key rule awarded both seats to the coalition or list with the largest vote only if it obtained more than double the vote of the second list; otherwise one seat went to the top list and one to the runner-up, benefiting coalitions such as Concertación and Alianza por Chile and disadvantaging smaller groups like the Christian Left (Chile), Humanist Party (Chile), Partido por la Democracia, and Movimiento Amplio Social. Thresholds, list alliances, and candidate ordering encouraged strategic pacts among parties including the Christian Democratic Party (Chile), Socialist Party of Chile, Radical Party of Chile, National Renewal (Chile), and the Independent Democratic Union (UDI).
The binomial system institutionalized a two-coalition equilibrium, reinforcing the dominance of the Concertación and the Alianza. It produced incentives for convergence among ideologically diverse actors, affecting the calculus of politicians like Michelle Bachelet, Joaquín Lavín, Andrés Allamand, Isabel Allende (politician), and José Piñera. Smaller formations such as Revolución Democrática (Chile), Evópoli, Communist Party of Chile, and regional lists in Araucanía Region and Atacama Region often struggled to convert votes into seats. The system shaped party discipline, candidate selection by Political Parties in Chile, and legislative bargaining within the National Congress, influencing appointments to entities like the Supreme Court of Chile and interactions with presidents from Renovación Nacional and Partido Socialista de Chile.
Elections under binomial rules produced notable outcomes: the Chamber of Deputies of Chile elections, 1993 and Chamber of Deputies of Chile elections, 2005 illustrated the system’s tendency to split representation between the two main coalitions despite vote shares. The Senate of Chile election, 1989 and subsequent Senate of Chile elections displayed similar patterns, with senators such as Andrés Zaldívar and Jorge Lavandero emblematic of coalition strength. Case studies include the 2009–2010 cycle that saw Sebastián Piñera win the Chilean presidential election, 2009–10 while the legislature remained balanced, and analyses of regional contests in Valparaíso Region, Biobío Region, and Santiago, Chile show coalition coordination like that between Progressive Party (Chile) figures and mainstream parties. The binomial system’s arithmetic frequently turned sizeable minorities into parliamentary minorities, as seen in the Chamber of Deputies of Chile elections, 2013 results for parties such as the Ecologist Party of Chile.
Scholars, politicians, and civil society groups criticized the binomial system for democratic distortions, citing voices from Human Rights Commission of Chile, academics at the Pontifical Catholic University of Chile, University of Chile, and commentators in media such as El Mercurio and La Tercera. Critics including leaders from the Student protests in Chile, 2011–2013 and parties like the Autonomist Movement (Chile) argued the system underrepresented emerging movements such as Movimiento Autonomista and Nueva Mayoría splinters, entrenched elite pacts linked to families like the Kast family and personalities such as Alejandro Guillier. Debates about proportionality, vote-seat distortion, and regional representation involved comparative references to systems used in Germany, Spain, and the United Kingdom.
Sustained pressure from social movements, academics, and political leaders including Michelle Bachelet culminated in the 2015 electoral reform passed by the National Congress of Chile, replacing binomial rules with a new proportional system inspired by the Sainte-Laguë method and multi-member districts implemented for the Parliament of Chile elections, 2017. The reform reshaped party strategies for entities such as Movimiento Amplio Social, Comunes (Chile), Democratic Revolution (Chile), and Partido Liberal (Chile), and led to shifts in representation in subsequent elections affecting figures like Giorgio Jackson and Gabriel Boric. Post-reform analysis by institutions like the Electoral Observation Mission and researchers at the Centro de Estudios Públicos continues to compare pre- and post-binomial outcomes across regions including Magallanes Region and Los Lagos Region.
Category:Electoral systems