Change: US revokes Venezuelan diplomat's visa

Once, President Obama tried to 'engage' Venezuelan dictator Hugo Chavez, but those days may be gone. In retaliation for Chavez's refusal to accept the credentials of US diplomat Larry Palmer as the ambassador to Venezuela, the United States on Wednesday revoked the visa of Venezuelan ambassador to the US Bernardo Alvarez. Marking one of the sharpest exchanges of diplomatic barbs between the two