Legislative Cosponsorhip Networks in the U.S. House and Senate
Social Networks, Vol. 28, No. 4, pp. 454-465, October 2006
Posted: 20 Aug 2007
Abstract
In the U.S. House and Senate, each piece of legislation is sponsored by a unique legislator. In addition, legislators can publicly express support for a piece of legislation by cosponsoring it. The network of sponsors and cosponsors provides information about the underlying social networks among legislators. 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.
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