Associated Press
Students shout slogans during a demonstration to protest a possible return of the old ruling Institutional Revolutionary Party (PRI) in Mexico City, Wednesday, May 23, 2012. Demonstrators also protested against what students perceive as a biased coverage by major Mexican TV networks of the presidential elections campaign, which they claim to be directed in favor of PRI's candidate Enrique Pena Nieto.  Mexico will hold presidential elections on July 1.  (AP Photo/Alexandre Meneghini)

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