BOGOTA (Reuters) - More than a dozen Colombian politicians agreed in 2001 to cooperate with right-wing paramilitary criminals, says a document revealed on Friday, fueling the country's worst political scandal in years. Three members President Alvaro Uribe's congressional coalition have been sent to prison for their links with the drug-running militias, and more lawmakers were under investigation before paramilitary leader Salvatore Mancuso turned the document over as part of his court case. Signed by militia bosses including Mancuso, who this week admitted he ordered massacres and 336 assassinations in the name of fighting left-wing rebels, the document also carries the...