Relations between Colombia and Venezuela tense after Colombia failed to condemn coup attempt *** BOGOTA, Colombia - The United States isn't the only government facing tough questions about its seemingly pleased response when it appeared Venezuelan President Hugo Chavez had been ousted from office last week. Neighboring Colombia also has some explaining to do. Relations between the two countries, already rocky over allegations that the left-leaning Chavez is supporting Colombian rebels, may be difficult to mend.***