"There are two important countries at the north of South America. One, Colombia, has a democratic government that, with strong support from the Clinton and Bush administrations, has bravely sought to defeat brutal militias of the left and right and to safeguard human rights. The other, Venezuela, has a repressive government that has undermined media freedoms, forcibly nationalized industries, rallied opposition to the United States and, recent evidence suggests, supported terrorist groups inside Colombia. That U.S. unions, human rights groups and now Democrats would focus their criticism and advocacy on the former, to the benefit of the latter, shows how far they have departed from their own declared principles."
Just like Israel it looks like Colombia is being singled out not because it is particularly in the wrong but because the cause of human rights is being perverted as a means to attack those perceived as on the wrong political 'side'.