You need permission to run for Congress in this steamy northern Colombian town where right-wing militias hold sway — that is, if you value your life. Juan David Diaz canceled a campaign stop ahead of Sunday’s national elections after receiving a warning that he would be assassinated if he set foot in this town of 160,000. The opposition candidate says he is under threat for helping expose ties between outlawed paramilitary groups and a powerful businesswoman who is a powerbroker in Magangue. Earlier this month, one of his campaigners was found decapitated. Full Story