This is what I refered to earlier:
http://today.reuters.com/news/articl...Q-USA-LABS.xml
Also, the U.S. has a history of interference. What about the coup d'etat that we sponsored to overthrow the Venezuelan president (elected by his people, I might add), Hugo Chavez? What about the killing of General Torrijos in Panama in 1981 because he refused to back down from the treaty he signed with President Carter which put the Panama Canal back in Panamanian hands and was all but set to sign a deal with Japan to build a new canal which wouldn't have locks and would allow more traffic. But, since Bachtel wasn't going to build it and all those billions of dollars would go to Japan, Reagan decided to have him killed. His private plane was bombed and enough evidence was presented to prove that the CIA did it.
Also, look no further than Ecuador. Their Amazon region is oil rich and we've been "pressuring" their government to allow U.S. companies to exploit it since the mid-70's. We even killed their democratically-elected president, Jaime Roldos, in 1981 (shortly before Torrijos) in the same manner.
The U.S. has interfered in too many countries and it's been a Republican President each time (Reagan, Daddy Bush, and Baby Bush). Why, you might ask? Because they are the ones with the oil interests. They are tied to the oil industry and will do antything to make sure we control the countries that have it, even if it costs us American lives.