Vital Statistics on Congress is the definitive source of essential information for all those who watch Congress--as citizens, journalists, political scientists, students, lobbyists, and even as staff and members of the institution. The volume is an invaluable tool for observing and evaluating the changing shape of politics and the legislative branch of government.

The fourth update of the original 1980 volume is intended for all those who watch Congress as journalists, political scientists, students, lobbyists, citizens--even as staff and members of the institution itself.

Norman J. Ornstein is a resident scholar at AEI and a regular contributor to Roll Call. Thomas E. Mann is a senior fellow and director of intergovernmental studies at the Brookings Institution. Michael J. Malbin is associate director of the Republican Conference on the U.S. House of Representatives.