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I use a number of statistics to describe the cosponsorship network in order to show that it behaves much differently than other large social networks that have been recently studied. In particular, the cosponsorship network is much denser than other networks and aggregate features of the network appear to be influenced by institutional arrangements and strategic incentives. I also demonstrate that a weighted closeness centrality measure that I call ‘connectedness’ can be used to identify influential legislators."}}]},{"typeName":"publication","multiple":true,"typeClass":"compound","value":[{"publicationCitation":{"typeName":"publicationCitation","multiple":false,"typeClass":"primitive","value":"James H. Fowler. 2004. \"Legislative Cosponsorship Networks in the U.S. House and Senate.\" Social Networks, 28 (4), 454-465: doi:10.1016/j.socnet.2005.11.003. <a href= \"http://jhfowler.ucsd.edu/legislative_cosponsorship_networks.pdf\" target= \"_new\">article available here</a>"}},{"publicationCitation":{"typeName":"publicationCitation","multiple":false,"typeClass":"primitive","value":"James H. Fowler. 2004. \"Legislative Cosponsorship Networks in the U.S. House and Senate.\" Social Networks, 28 (4), 454-465: doi:10.1016/j.socnet.2005.11.003. <a href= \"http://jhfowler.ucsd.edu/legislative_cosponsorship_networks.pdf\" target= \"_new\">article available here</a>"}},{"publicationCitation":{"typeName":"publicationCitation","multiple":false,"typeClass":"primitive","value":"James H. Fowler.  2006. \"Connecting the Congress: A Study of Cosponsorship Networks.\" Political Analysis, 14 (4), 456-487: doi:10.1093/pan/mpl002. <a href= \"http://dvn.iq.harvard.edu/dvn/dv/jhfowler/faces/study/StudyPage.jsp?studyId=7093\" target= \"_new\">study available here</a>"}}]},{"typeName":"productionDate","multiple":false,"typeClass":"primitive","value":"2004"},{"typeName":"distributor","multiple":true,"typeClass":"compound","value":[{"distributorName":{"typeName":"distributorName","multiple":false,"typeClass":"primitive","value":"James H. 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