reincorporation to civilian life of armed rebel groups. Early attempts at reform under the Barco presidency In 1986, Liberal candidate Virgilio Barco was elected to the presidency on a platform of national reconciliation. In January 1988, Barco unexpectedly revived the idea of substantial constitutional change by proposing the organization of a plebiscite, alongside the March 1988 local elections, to repeal article 13 of the 1957 plebiscite. The president hoped that a plebiscite would give legitimacy to the repeal of this article (which had also been approved by plebiscite). However, Barco was forced to shelve the idea because of the lack of political consensus around his proposal. Instead, in February 1988, Barco signed a bipartisan agreement with leaders of the Liberal and Conservative parties (the Acuerdo de la Casa de Nariño) which included agreement on the organization of a "process of institutional readjustment" - the creation of a constituent body, originating in Congress, which would submit a proposal for constitutional reform to Congress. The process was suddenly halted by the Council of State's ruling on April 4, 1988, which declared it to be unconstitutional. A later attempt to resuscitate the original idea of a plebiscite was rejected by the government itself in December 1988, after a group of congressmen had tried to add a question banning extradition. Meanwhile, Barco's policy of national reconciliation had been successful - four guerrilla groups demobilized between 1989 and 1990. The M-19 was the first group to accept the government's offer to dialogue in 1988, culminating in the movement surrendering their weapons in March 1990. The M-19's demobilized members became a political party, known as the Democratic Alliance M-19 (AD M-19), in 1990. In 1991, the Workers' Revolutionary Party (PRT), most fronts of the Popular Liberation Army (EPL) and the Movimiento Armado Quintin Lame (MAQL) all demobilized. One of the terms for their demobilization was their (limited) participation in a constituent assembly. The Revolutionary Armed Forces of Colombia (FARC) supported a new constitution, but did not demobilize. The left-wing Patriotic Union (UP), created in 1985 as the FARC and the Communist Party's legal political wing, also supported a new constitution. Student movement and the séptima papeleta A student-led movement called Todavía podemos salvar a Colombia ("We can still save Colombia"), born from the August 1989 'silent march' and predominantly spearheaded by student and faculty from the most prestigious private universities of Bogotá (Universidad del Rosario, Pontificia