MEXICO CITY - Mexico's presidential contenders lock horns for a final televised debate on Sunday night with front-runner Enrique Pena Nieto under mounting pressure from student-led opposition.

Pena Nieto, candidate of the opposition Institutional Revolutionary Party (PRI), has led polls for the July 1 election for over two years, but in the past month the race has tightened due to growing misgivings about the possible return of the PRI.

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