A demonstrator holds a placard as he attends a protest against Nieto at the Zocalo square in Mexico City

 
A demonstrator holds a placard as he attends a protest against Nieto at the Zocalo square in Mexico City
A demonstrator holds a placard as he attends a protest against Enrique Pena Nieto, presidential candidate of the opposition Institutional Revolutionary Party (PRI) and media censorship in the electoral campaign before the July 1 presidential elections at the Zocalo square in Mexico City May 19, 2012. According to surveys, Pena Nieto is hot favourite to win the presidency. The placard reads, "I sign. Vote for me, Pena and privatized." REUTERS/Edgard Garrido (MEXICO - Tags: POLITICS CIVIL UNREST ELECTIONS)