Hugo Chavez sought to cement his power and end presidential term limits in a vote Sunday that the government and opposition said was too close to call. "The result of the referendum is close," Vice President Jorge Rodriguez said from Chavez's headquarters for the vote on a constitutional overhaul. "We will respect the result, whatever it is - even if it's by one single vote." He said some polling stations remained open late and the electoral council was still awaiting results from 20 percent of them. "We'll honor the referee's decision, and we call on the other side to do the same." Opposition leader Julio Borges likened the results to a photo finish.