The study of “split-ticket voting” has become a non-negligible topic in political science recently as the upsurge in ticket-splitting has led to a major impact on U.S. politics, at both the national and state levels, by making divided governments normal rather than exceptional. In fact, split-ticket voting occurs not only in presidential democracies; voters in many parliamentary democracies such as Australia, New Zealand, Germany, Japan, and Israel also split their tickets in elections because of various ballot structures of the electoral systems.