Managing midterm vacancies: Institutional design and partisan strategy in the Australian parliament, 1901–2013

This article explores how replacement rules for midterm vacancies affect legislative turnover in the context of majoritarian and proportional electoral systems. The differing electoral rules and replacement procedures for the two chambers of the Australian parliament over more than a century permit an analysis of the complex interplay between institutional rules, party strategy, and patterns of representation between 1901 and 2013. Since 1901, the Australian House of Representatives has been committed to single member electoral systems and by-elections for filling midterm vacancies, but major changes to both the electoral system and midterm replacement rules for the Australian Senate have played a critical role in enhancing party control of Senate careers.