When determining whether or not legislators are representing their constituents' interests, scholars using voting studies may overstate the role of strategic factors, such as reelection goals and constituent influence, while understating the effect of descriptive characteristics. I argue that race and ethnicity matter in congressional oversight of bureaucratic policymaking. My examination of hearing transcripts from the 107th Congress indicates that minority legislators are more likely than white legislators to participate in racial‐oversight hearings but not more likely than whites to participate in social welfare hearings. The results show that descriptive representation contributes to substantive representation, even if the costs of participating outweigh the electoral benefits.

Despite claims that diversity benefits the democratic process, critics question whether increased diversity significantly improves government responsiveness and accountability beyond electoral competition and constituency influence. The authors advance a diversity infrastructure theory to explain why and how minority legislators have kept minority interests on the congressional agenda. Using data on congressional hearings held on civil rights and social welfare from 1951 to 2004, the authors find that despite the decline of national attention to civil rights and social welfare issues in general, increased diversity in the House and to a lesser extent in the Senate is responsible for keeping minority interests on the congressional agenda.

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Despite claims by normative theorists that gender diversity in Congress leads to better representation of women’s interests, the results of empirical studies have been largely mixed. While some scholars have found positive effects of gender diversity, others have found very little impact. We argue that it is not the presence of White and minority women alone that makes political institutions more responsive to women’s issues, but rather it is the organizational presence of minority men along with minority women who make similar claims for inclusion, power, and organizational formation to achieve those goals that matters. We examine to what extent gender and racial diversity have led to more attention to issues that directly and indirectly impact women. Using congressional hearings data from 1951–2004, we find that the increased presence of minority men and women legislators in the House, but less so in the Senate, is responsible for keeping women’s interests on the congressional agenda. We demonstrate how an intersectional and additive approach can add both theoretical and empirical value to the study of political representation by demonstrating the impact of women and minorities in Congress.