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Rosario Ibarra de Piedra (born in Saltillo, Coahuila in 1927) is an activist and prominent figure in the politics of Mexico. She has been a presidential candidate and is currently the president of Comité Eureka.
In March 2006, the Party of the Democratic Revolution (PRD) designated Ybarra as its candidate to the Senate via proportional representation to serve during the LX Legislature (2006–2009) and during the LXI Legislature (2009–2012); she won.
Ibarra, who was born to an agricultural engineer father and a violinist mother, is the mother of Jesús Piedra Ybarra, an activist who disappeared on April 18, 1975, in Mexico after the murder of the policeman Guillermo Valdez Villarreal. She studied in Monterrey, Nuevo León, and then met Jesús Ybarra, who would become her husband. She became involved with the community, especially when her son Jesús disappeared in Monterrey after being accused of being a member of the communist organization Liga Comunista 23 de Septiembre. When her cries for resolution were unheard she formed the Comité Eureka de Desaparecidos ("The Eureka Committee of the Disappeared") with about 100 other women in 1977. As a result of her efforts, including several hunger strikes, 148 out of 557 political prisoners on her lists were liberated during the López Portillo administration (1976–1982).
In December 2005, Carlos Solana Macías was apprehended for the abduction of Rosario's son.
In 1982 she became the first woman in Mexico to run for the presidency with the Workers Revolutionary Party. She became a federal deputy for Party of the Democratic Revolution for the 1985-88 term. In 1988 she ran for the presidency a second time, this occasion with the Labor Party, although she later declined in favor of Cuauhtémoc Cárdenas. In 1994 she became a federal deputy for the second time.
In March 2006 the Party of the Democratic Revolution (PRD) designated Ybarra as its candidate to the Senate via proportional representation to serve during the LX Legislature (2006-2009) and during the LXI Legislature (2009-2012); as a result of that designation she was able to secure a seat in the Senate representing the PRD, but in October 2006 she left the PRD faction in the Senate to join the Labor Party (PT) faction as part of a political negotiation between the PRD and the PT.