The polls' results, expected late Wednesday night, won't lead to a structural change in the central government or the National Assembly legislature, but they could still be important for Park, who is facing her biggest political crisis since she took office early last year. Candidates affiliated with Park's party have had comfortable leads in six of the 17 races, compared with five races that are led by opposition and independent candidates, according to various opinion surveys taken ahead of the polls. The surveys indicated that strong public criticism of Park, mostly led by liberal, younger South Koreans, has likely pushed voters who typically make up Park's base — older, conservative people — to respond by rallying behind ruling party candidates in a country deeply split between left and right, said Prof.