There are grounds for optimism regarding the future of Mexico-US relations under the new administrations of President Enrique Peña Nieto and Barack Obama. Peña Nieto’s swift appointment of Eduardo Medina Mora as the new ambassador to the US was widely considered a positive sign. The former attorney general reputedly has an excellent relationship with the US anti-narcotics establishment. Given the importance of the Latino vote to his electoral victory and the return of the gun control debate to the top of the US domestic agenda, there has been more substance to the pledges on immigration and security made by Obama,…