Moon Jae-in (R), lawmaker of main opposition Democratic United Party, shakes hands with supporters before a news conference to announce his candidacy in the coming presidential election at the Independence Gate in Seoul June 17, 2012. A man, who was once jailed by South Korea's former military dictator Park Chung-hee, said on Sunday he would seek the centre-left's nomination to run for the presidency, likely setting up a contest with the daughter of the man who jailed him. Moon Jae-in, a former aide to ex-president Roh Moo-hyun, seeking to unite the fractured left in a battle that will likely pit the winner of the left's internal contest against Park Guen-hye, the ruling conservative party's candidate. REUTERS/Kim Hong-Ji (SOUTH KOREA - Tags: POLITICS ELECTIONS)