Venezuela’s authoritarian president, Nicolás Maduro, is expected to face a strong challenge from opposition candidate Edmundo González in Sunday’s presidential election. Maduro, a Socialist, is seeking a third term in office. Ten candidates are running. Several opinion polls have placed González ahead of Maduro, who has been in charge of the South American country for 11 turbulent years. But few observers inside or outside Venezuela expect a free and fair election when voters go to the polls. In the run up to election day, numerous members of the opposition were detained and candidates critica…