This is a hypergraph, where nodes are US Congresspersons and hyperedges are comprised of the sponsor and co-sponsors of bills put forth in the Senate. Some hyperedges are repeated. The dataset was derived from James Fowler's data. Each node is labeled with political party affiliation. Some summary statistics of the dataset are:

• number of nodes: 294
• number of hyperedges: 29,157
• mean / median hyperedge size: 8.0 / 4.0
• rank of hypergraph (maximum hyperedge size): 99
• number of node classes: 2

Data:

• senate-bills.zip

If you use this data, please cite the following papers:

• Generative hypergraph clustering: from blockmodels to modularity.
  Philip S. Chodrow, Nate Veldt, and Austin R. Benson.
  Science Advances, 2021. [bibtex]
• Connecting the Congress: A Study of Cosponsorship Networks.
  James H. Fowler.
  Political Analysis, 2006. [bibtex]
• Legislative Cosponsorship Networks in the U.S. House and Senate.
  James H. Fowler.
  Social Networks, 2006. [bibtex]