Friends or Foes? The Influence of Political Allies and Social Movement Activity on Environmental Legislation in Congress* Susan Olzak, Sarah A. Soule, Marion Coddou, and John Muñoz Stanford University Unpublished Manuscript December 13, 2013 *NSF Collaborative Grants SES-0620577, SES-9911296, and SES-9709356 supported this research. An earlier version of this paper was presented at the 2012 annual meeting of the American Sociological Association in Denver, Colorado. All of the authors would like to thank Madison Bell, Brian Cook, Jonathan Haynes, Chandler Johnson, Thomas Scher, John Scott, Wenkai Kay, Vanessa Gaines, Chelsea Barabas, Liz Warburton, Denny Won, Rosie Winn, and Noona Oh for their excellent research assistance. In addition, we thank Bob Brulle for his expert advice in helping us select legislation topics and for sharing his data on lobbyist organizations with us. We also thank Paul Burstein, Corey Fields, Keith Krehbiel, and Jonathan Woon for providing useful suggestions on earlier drafts of this paper.