Description:South Koreans head to the polls to vote for a new president, in what's become a tight race to lead the country. The election pits Park Geun-hye, the daughter of a former military ruler, against Moon Jae-in, a man jailed for political activism under Park's father. Park, who cast her ballot in Seoul, is running as the ruling party candidate. She has a narrow lead in polls and will become South Korea's first female leader if voting goes her way.(1:08)