During the rule of the Concertación, the CEP became an intellectual centre of great academic prestige and influence.
In 2009-2010, Frei ran for the presidency of Chile for a second time, again as the candidate of the centre-left Concertación center-coalition, promising continuity of the popular outgoing President Michelle Bachelet's path.
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He attempted a comeback as the candidate of the ruling Concertación coalition for the 2009 presidential election, but was narrowly defeated.
Political differences with certain members of the governing Concert of Parties for Democracy (Spanish: Concertación de Partidos por la Democracia) brought about his move to the private sector after almost seven years in the Public Sector.
With the popularity of the Bachelet administration at a low, and the Concertación's support suffering, Lagos Weber announced his resignation on December 6, 2007, to make his candidacy for the Senate of Chile for the district of the Valparaíso Region in the December 2008 election.
In December 1989, in Chile, Laura Rodríguez became the first elected representative of any Humanist Party in the world after winning a seat as part of the Concertación coalition, after Augusto Pinochet handed over power.
In December 1990, in Chile, Laura Rodríguez became the first elected representative of any Humanist Party in the world after winning a seat as part of the Concertación coalition, after Augusto Pinochet handed over power.
Left-wing deputies of the Concertación, such as Carlos Montes (PS) and Denisse Pascal (PS), requested his transfer to the Punta Peuco prison, considered as more tightly guarded and where condemned militaries would enjoy less freedom of action than in the military prison.