I have an online subscription to The Nation and this article was very interesting:

[the_future_modernes]

What can Obama do in Latin America?

On many fronts, however, the president is likely to discover that his real obstacles to progress south of the border lie uncomfortably close to home.
In preparation for the summit, the Obama administration has made some overtures to Cuba, responding to demands by nearly every Latin American country that Washington end its cold war against Havana. The need to keep Democratic senators from Florida and New Jersey (states with large Cuban-American populations) in the fold means that the general travel ban and trade embargo will, however, stay in place, at least for now. (In 1933, Hull tried to prevent the Cuban envoy from speaking, fearing that he would give a fiery anti-American speech; Gruening appealed to the principle of free speech to reverse the ban.)
Obama will probably reiterate recent official statements by Secretary of State Hillary Clinton, among others, that the United States bears real responsibility for Mexico's drug-war violence and perhaps bemoan the way an "inability to prevent weapons from being illegally smuggled across the border" fuels drug-related killings. Like every other administration, though, Obama's will have to answer to the National Rifle Association (NRA), which at this point carries out its own foreign policy.

In 2005, for example, when Brazil held a referendum to implement a stringent gun-control law, the NRA spent considerable money lobbying to successfully defeat it. So expect the NRA to fight any attempt to stem the flow of guns south of the border. In fact, Wyoming senator John Barrasso hopes to use the fear of Mexican drug violence to force a greater distribution of assault weapons. As he put the matter, "Why would you disarm someone when they potentially could get caught in the crossfire?... The United States will not surrender our Second Amendment rights for Mexico's border problem."

And so it goes: On nearly every issue that could either actually help relieve the suffering of Latin Americans or allow the US to win back strategic allies, domestic politics will hinder Obama's range of action, even if not his immediate popularity.MORE