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People attend a national convention of the Institutional Revolutionary Party (PRI), in Mexico City, Sunday, March 3, 2013. Mexico's ruling party changed on Sunday its platform to allow a reform that could bring private investment into the state-owned oil monopoly, in a country where oil is a source of national pride. (AP Photo/Marco Ugarte)

Associated Press
People attend a national convention of the Institutional Revolutionary Party (PRI), in Mexico City, Sunday, March 3, 2013. Mexico's ruling party changed on Sunday its platform to allow a reform that could bring private investment into the state-owned oil monopoly, in a country where oil is a source of national pride. (AP Photo/Marco Ugarte)
People attend a national convention of the Institutional Revolutionary Party (PRI), in Mexico City, Sunday, March 3, 2013. Mexico's ruling party changed on Sunday its platform to allow a reform that could bring private investment into the state-owned oil monopoly, in a country where oil is a source of national pride. (AP Photo/Marco Ugarte)
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