GUATEMALA CITY (AFP) - Polls opened early Sunday in Guatemala's runoff presidential election, in an acrimonious atmosphere exacerbated by charges of vote buying. Over 7.3 million Guatemalans are eligible to take part in the polls pitting right-wing retired general Otto Perez Molina against wealthy businessman Manuel Baldizon.Ahead of the vote, Perez Molina said government officials had been handing out vouchers for roofing and food supplies to the poor in exchange for their votes for Baldizon. "I am asking the president... to take his hands off this vote, and stop using Guatemalans' money to try to buy votes.