This dissertation considers how district-level demographic factors favorable to women congressional candidates facilitate substantive representation of women's interests. I contribute to the existing research by linking the literature on women candidate emergence and electoral success with that on descriptive and substantive representation. Beyond simply asking whether and how women in Congress represent women's interests, I argue that the demographic characteristics of districts in which women are more likely to run and win public office also put women representing those districts in Congress in better position to cultivate feminist homestyles and substantively represent women's interests through legislative behavior. I examine whether women representatives in women-friendly districts are more likely than men representing similar districts, or women in less women-friendly districts, to sponsor legislation in women's issue areas, sponsors women's issue earmarks, and defect from party in women's issue roll-call votes. Overall, I find general support for my theory that district-level factors contribute to observed gender differences in legislative behavior in women's issue areas.

It is generally accepted among scholars that increases in descriptive representation result in increases in substantive representation. Although women's descriptive representation has increased in recent years, women are still underrepresented in politics. One reason for women's underrepresentation is that female candidates must overcome additional barriers in order to get elected, including on the low number of women in the pipeline to elected office, party gatekeeping, women's lower levels of political ambition, and voters' negative gender stereotypes about female candidates. Changes in women's descriptive representation and recent salience of women-friendly policies, such as abortion and paid maternity leave, has caused me to investigate whether implementation of these women-friendly policies result in an increase in women's descriptive representation. I assert that women-friendly policies reduce the barriers women must overcome to get elected to office. Specifically, the presence of more women-friendly abortion and paid maternity leave policies will result in an increase in women's descriptive representation at the state level. I find partial support for a relationship between these women-friendly policies and higher levels of women's descriptive representation. State-level abortion protections are associated with higher levels of women's descriptive representation in the state legislature.