All networks are directed graphs drawn with the Fruchterman-Reingold force-directed algorithm. The ties connect the first author of each bill to the cosponsors of that bill. The nodes are sized by unweighted total degree. When two nodes belong to the same group, any existing tie between them is given the color of that group. There is a guide to party codes and colors at the end of this page.
See the interactive visualization, or view other countries.
    1988–1991
       1991–1994
    1991–1994
       1994–1998
    1994–1998
       1998–2002
    1998–2002
       2002–2006
    2002–2006
       2006–2010
    2006–2010
       2010–2014
    2010–2014
       2014–
    2014–
      