George W. Bush's strategy of countering Venezuela's leftist president Hugo Chávez by strengthening ties to Colombia's rightist government has been undercut by fresh evidence of high-level drug corruption and human rights violations implicating President Alvaro Uribe's inner circle.

These new allegations about Colombia's narco-politics have tarnished Uribe's reputation just as Bush has been showcasing the Harvard- and Oxford-educated politician as a paragon of democratic values and an alternative to the firebrand Chávez, who has used Venezuela's oil wealth to finance social programs for the poor across the region.

Despite the corruption disclosures - and Uribe's failure to stem Colombian cocaine smuggling to the United States - the Bush administration continues to shower Uribe's government with trade incentives and billions of dollars in military and development aid.

With other regional leaders unwilling to side with the United States against Chávez, Bush may see little alternative but to stay the course with the 55-year-old Uribe and hope Colombia's corruption doesn't draw too much attention in the United States or across South America.