W omen's representation in national legislatures varies widely around the world. In 2012, only Rwanda and Andorra had achieved parity in women's representation in the national parliament, with 56% of the Rwandan Chamber of Deputies being female and exactly half the Andorran General Council represented by each sex. 1 In many other countries, women still have little representation in the national legislature, despite being almost 50% of the population. A large body of research has emerged to try to explain the wide variation across countries, with most of it focusing on cultural, socioeconomic, and electoral explanations (e.g., McDonagh 2002; Norris 1985; Reynolds 1999; Rule 1987; Tripp and Kang 2008). Recent scholarship, however, has suggested that the legislature itself is a gendered institution that marginalizes women and argues for greater attention to understanding exactly how legislative institutions affect women's representation