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It is often argued that electoral vulnerability is critical to constituency responsiveness. We investigate this possibility using different measures of vulnerability, but argue that in the United States the Republican Party may be less responsive than the Democratic Party due to its core constituency and view of representation. We test our hypotheses relying on an innovative research design that exploits referenda in U.S. states to compare legislator voting behavior with voter preferences on exactly the same policy proposal, allowing us to overcome the measurement problems of much previous research. Based on a newly compiled data set of more than 3,000 voting decisions for 818 legislators on 27 referenda, we find high levels of congruence, but that congruence with the median voter is higher for legislators who are running for reelection. We also find that Democrats are more responsive after a close election but that Republicans are not sensitive to electoral margins. [ABSTRACT FROM AUTHOR]

Voters are increasingly concerned that special interests control the policy process. Yet, the literature on representation is more optimistic: elected officials face strong incentives to listen to voters—not just lobby groups—and this makes for more responsive policies. Building on recent work, we argue a more nuanced point: different types of groups have different effects on responsiveness. We show empirically that lobbying from "cause" groups—representing diffuse interests like climate change—strengthens responsiveness, while lobbying from "sectional" groups—representing industry and professional associations—has no observable effect. Our project uses a novel data set of Canadian lobbying registrations spanning fifteen policy areas from 1990 to 2009. Using a dynamic panel model, we test how interest group lobbying moderates the effect of voter issue attention on government spending. Our findings contribute to contemporary debates over the influence of organized groups, suggesting some interest groups may improve representation. [ABSTRACT FROM AUTHOR]