A tight presidential race in South Korea

The candidates, Moon Jae-in and Park Geun-hye are in a race to be South Korea's next president.
The candidates, Moon Jae-in and Park Geun-hye are in a race to be South Korea's next president.

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    A tight presidential race in South Korea

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South Korean voters head to the polls to elect their next president, as CNN's Paula Hancocks reports.