In recent years, some Japanese prime ministers have exhibited a nationalistic tendency, particularly in their foreign policies. The increasing nationalistic appeal by recent leaders marks a sharp contrast with previous leaders, who were unwilling to cause friction with other countries and thus took more centrist positions. More interestingly, those recent leaders, including Koizumi Junichiro, previously adopted a more modest stance. This article seeks to explain the increase in nationalistic appeal, particularly between 2001 and 2006, among Japanese leaders by focusing on some important changes in the Liberal Democratic Party's (LDP's) presidential election procedures. Drawing on the study of US primary elections, I argue that the increase in the weight of rank-and-filers' votes vis-à-vis the LDP Diet members' votes in the LDP presidential election encouraged some candidates to take more ideologically extreme positions. In other words, much like US primaries, the LDP presidential elections can have a tendency to pull some candidates toward extreme positions.
