President Barack Obama and Mexico's President Enrique Pena Nieto, right, leave a joint news conference in Mexico City, Mexico, Thursday, May 2, 2013. Obama sought on Thursday to tamp down a potential rift with Mexico over a dramatic shift in the cross-border fight against drug trafficking and organized crime, acceding that Mexicans had the right to determine how best to tackle the violence that has plagued their country. (AP Photo/Dario Lopez-Mills)

Associated Press
President Barack Obama and Mexico's President Enrique Pena Nieto, right, leave a joint news conference in Mexico City, Mexico, Thursday, May 2, 2013. Obama sought on Thursday to tamp down a potential rift with Mexico over a dramatic shift in the cross-border fight against drug trafficking and organized crime, acceding that Mexicans had the right to determine how best to tackle the violence that has plagued their country. (AP Photo/Dario Lopez-Mills)
President Barack Obama and Mexico's President Enrique Pena Nieto, right, leave a joint news conference in Mexico City, Mexico, Thursday, May 2, 2013. Obama sought on Thursday to tamp down a potential rift with Mexico over a dramatic shift in the cross-border fight against drug trafficking and organized crime, acceding that Mexicans had the right to determine how best to tackle the violence that has plagued their country. (AP Photo/Dario Lopez-Mills)
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