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Interest
GroupInfluence i n t he U. S.
CongressThis essay critically reviews research published in the last decade that explores how lobbyists and interest groups influence the actions of the U.S. Congress. The research is extensive and contains a rich, but often conflicting, set of findings about the influence of interest groups. The purpose of this essay is to inventory, review, and critique this research in ways that convey as clearly as possible the status of our current understanding of the nature and level of interest group influence in the U.S. Congress. This essay reviews research published in the last decade that explores how lobbyists and interest groups influence the actions of the U.S. Congress. Beginning in the 1960s and continuing through the 1980s, the number, diversity, and activity of the interest groups represented in Washington increased dramatically. Some observers of the Washington scene, mainly journalists, argue that this rise in interest group activity fundamentally altered the political landscape in Washington and that interest groups now enjoy far more influence in Congress than they once did. Other observers, mainly scholars of interest groups and Congress, are far less certain about the effects of the rise of interest group activity. They have produced in the last decade a wealth of research that, when taken together, presents a far more mixed picture of interest group influence. The purpose of this essay is to inventory and review this research so as to convey as clearly as possible the status of our current understanding of the nature and level of interest group influence in the U.S. Congress. This essay is a critical review in the sense that it points out various methodological shortcomings in the recent research in ways that cast doubt on the veracity of many of the claims and conclusions of that research. The intent is to indicate some of the strengths and weaknesses of the existing research so as to give a clearer sense of what we do and do not know about interest group influence in the U.S. Congress. A critical review helps make sense of conflicting findings, helps underscore how tentative our understanding of basic influence processes is, and helps define future research agendas.