Park guided the party to an upset victory, returning its majority in the National Assembly. This contributed to an increase in her poll ratings and consolidated her position as frontrunner for the Saenuri nomination. Opposition to Saenuri was divided primarily between the Democratic United Party and independent supporters of Ahn Cheol-soo, who emerged as a leading potential candidate despite his ostensible silence on the race. In the DUP, focus initially lay on Sohn Hak-kyu as a potential nominee, but by late 2011 Moon Jae-in, a confidant of former president Roh, had overtaken Sohn in polls. Although the DUP invited Ahn to join the party, only 2.3% of respondents to a poll on 21 April thought that Ahn was best suited to be DUP nominee. The DUP itself has been troubled by the split between pro-Roh members such as Moon Jae-in and the "Honam wing" of former president Kim Dae-jung, represented by Chung Dong-young. Registered candidates Ballot numbers for party candidates were given according to the candidate's party seat distribution in the National Assembly. Ballot numbers for independent candidates were determined through a random lottery by the National Election Commission. Nominations Democratic United Party Nominee Campaign The 2012 Democratic United Party presidential primary saw an open primary system implemented for the first time. This new open primary introduced "mobile voting"; it was hailed as a "revolution in voting" because people could participate in voting more conveniently. However, controversies persisted during the primary elections, as questions of the legitimacy and trustworthiness of the voting results were raised. The official result was announced on 16 September 2012, at 15:32 KST, naming Moon Jae-in the presidential candidate from the Democratic United Party. After winning the nomination, Moon stated that he would like to join forces with Ahn Cheol-soo. Candidates Moon Jae-in, Member of National Assembly Sohn Hak-kyu, former Governor of Gyeonggi Kim Doo-kwan, former Governor of South Gyeongsang Chung Sye-kyun, Member of National Assembly from Seoul Park Joon-young, Governor of South Jeolla Jo Gyeong-tae, Member of National Assembly from Busan Kim Jung-kil, former Minister of the Interior Kim Yong-hwan, former Member of National Assembly from Gyeonggi Jo, Kim J and Kim Y were disqualified by the party through a cutoff poll, where only top five candidates were allowed to pass to primaries. Park withdrew before the primaries began. Results P= Pre-registered electors who voted at Polling booths; M: Pre-registered electors who voted through Mobile