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| Two-round system | |
|---|---|
| Name | Two-round system |
| Type | Electoral system |
Two-round system The two-round system is an electoral method used to elect officeholders in single-member constituencies through a potential second ballot if no candidate achieves a required threshold in the first ballot. It is employed in presidential, legislative, and local contests across diverse polities and has shaped contests involving figures such as Charles de Gaulle, François Mitterrand, Konrad Adenauer, Václav Havel, and Nelson Mandela. The system interacts with institutions like the Constitution of France, Electoral Commission (United Kingdom), National Assembly (France), Bundestag, and African National Congress.
The two-round system originated in models influenced by the French Third Republic, the Napoleonic Code, and electoral reforms during the 19th century, incorporating ideas debated at the Congress of Vienna and in writings by theorists who influenced the Revolution of 1848 and the July Monarchy. It is defined by an initial ballot that, if no candidate meets a predefined threshold—often an absolute majority—triggers a runoff between leading contenders. Variants have been enacted under constitutions such as the Constitution of the Fifth Republic (France), the Constitution of Russia (1993), and amendments to the Constitution of Argentina and statutes like the Electoral Act (South Africa).
Mechanically, the system can require an absolute majority in the first round, as codified in the Constitution of France (1958), or permit a second-round qualification threshold as in the Constitution of Italy (1948) and the Law on Presidential Elections (Russia). Variants include plurality-runoff models practiced in regions influenced by the United States presidential election system debates, modified two-round rules found in the Portuguese Constitution, and semi-presidential adaptations in states like Ukraine and Poland. Some implementations allow any candidate exceeding a vote share threshold to advance, as seen in contests monitored by the Organisation of African Unity and later the African Union, while other models restrict the runoff to the top two, resembling practices in elections overseen by the Inter-American Democratic Charter and observers from the Organization for Security and Co-operation in Europe.
Historically, the two-round procedure spread from Western Europe—especially France and Belgium—to parts of Latin America such as Argentina and Brazil; to parts of Africa including Gabon, Chad, and Senegal; and to parts of Asia like Indonesia and South Korea. Notable adoptions occurred during constitutional transitions: the postwar reconstruction era involving the Marshall Plan and post-Cold War democratizations in states such as the Czech Republic and Romania. International election observation missions by bodies like The Carter Center, European Union Election Observation Mission, and United Nations electoral assistance have influenced reforms in jurisdictions including Kenya and Ivory Coast (Côte d'Ivoire).
Proponents reference outcomes in high-stakes contests featuring leaders like Charles de Gaulle and François Mitterrand to argue the system secures majority legitimacy, reduces spoilers associated with the Front National, and fosters broad coalitions akin to alliances seen in the Christian Democratic Union and Socialist Party (France). Critics point to fragmentation problems and voter fatigue observed in elections involving the Workers' Party (Brazil) and the Institutional Revolutionary Party's history, argue that runoff mobilization advantages incumbents as in races with Vladimir Putin or Recep Tayyip Erdoğan, and note administrative costs reported by electoral bodies such as the Electoral Commission (South Africa) and the Federal Election Commission (United States). Observers from the International Foundation for Electoral Systems and scholars referencing cases like Kenya 2007 debates highlight concerns about polarisation, post-runoff alliances, and legal disputes adjudicated by courts such as the Constitutional Court of Colombia.
The two-round system affects party strategies in ways comparable to coalition dynamics within the European People's Party and the Social Democratic Party of Germany, often incentivizing pre-runoff alliances similar to those between the Liberal Democrats (UK) and other centrist formations. It can encourage vote transfers analogous to endorsement patterns involving figures such as Angela Merkel or Tony Blair, and induce strategic candidacies and withdrawals observed in contests involving the Democratic Party (United States), Republican Party (United States), and regional parties like Basque Nationalist Party. Political scientists analyzing systems in the Comparative Political Studies tradition compare its effects to alternative rules used by the Single Transferable Vote in Ireland and proportional formulas used in the Netherlands and Sweden.
Notable runoffs include the French presidential contests of 1969, 1981, and 1995; the Argentine presidential races involving Raúl Alfonsín and Carlos Menem; the 2004 and 2012 presidential elections in Ukraine featuring Viktor Yushchenko and Viktor Yanukovych; the contested 2007 presidential election in Kenya and the subsequent 2017 rerun; the 1994 South African election that elevated Nelson Mandela; and the 2010 and 2015 presidential contests in Chile and Peru that prompted constitutional and statutory debates in the National Congress of Chile and Congress of the Republic of Peru. Election observation reports by International Republican Institute and National Democratic Institute have assessed runoffs in countries ranging from Senegal to Indonesia.
Category:Electoral systems