Former prime minister Evaristo Carvalho has been elected president of Sao Tome and Principe, the election commission said on Monday, after incumbent Manuel Pinto da Costa dropped out of the race citing voting irregularities in the first round. Carvalho won 42,058 votes in Sunday’s poll, the National Electoral Commission (CEN) said, announcing provisional results. Only 46 percent of voters voted and of those 18 percent turned in blank or invalid ballots, said CEN chairman Alberto Pereira.