President Obama is making the longest U.S. presidential visit to Colombia . Obama announces a program to help U.S. businesses access southern markets . The sixth Summit of the Americas wo n't include Cuba , however . Comment:
President Obama is making the longest U.S. presidential visit to Colombia . Obama announces a program to help U.S. businesses access southern markets . The sixth Summit of the Americas wo n't include Cuba , however . The hemisphere 's drug war is expected to be addressed .