Do presidential campaigns matter outside the United States? We examine how public opinion responds to campaign events during Korean presidential campaigns. The fundamental variables of the election year influence vote intention before the campaign begins and substantially influence eventual vote choice. Campaign events assist voters to learn more about the fundamental variables – regionalism, party identification, and retrospective evaluations of the incumbent administration – and this leads to more informed intentions during the campaign. The results suggest that there is substantial congruence in the explanatory power of Holbrook’s ‘equilibrium’ theory and Gelman and King’s ‘enlightenment’ theory in presidential campaigns held in the US and in Korea.