Alternative Paths to Party Polarization: External Impacts of Intraparty Organization in Japan

Although party polarization is one of the most significant focal points in the study of contemporary US politics, a limited number of studies have examined its theoretical implications for other countries. In addition, a great deal of effort has been made in the study of the changes in voting bases (i.e., constituencies or interest groups). However, little attention has been given to the features of party organization. In this study we look at the process of polarization between two major parties in Japan in recent years and analyze the way Japanese parties took an alternative path to polarization. We argue that party polarization can be caused by the strategic position-taking of the party executive in addition to the centralization of the party organization.