By Matthew Bristow and Oscar Medina, Bloomberg News In a victory speech delivered from behind a bulletproof screen, on a barge in a Caribbean river estuary, Abelardo de la Espriella vowed to hunt down Colombia's worst criminals. "Here is a tiger who defends the law with claws and teeth," he told cheering supporters last month in Barranquilla, many dressed like him in the national soccer shirt. "We deserve a Colombia in which bandits are in prison."