- Alabama: Jeff Sessions-R; Richard C. Shelby-R
- Alaska: Mark Begich-D; Lisa Murkowski-R
- Arizona: Jon Kyl-R; John McCain-R
- Arkansas: Blanche L. Lincoln-D; Mark L. Pryor-D
- California: Barbara Boxer-D; Dianne Feinstein-D
- Colorado: Michael F. Bennet-D; Mark Udall-D
- Connecticut: Christopher J. Dodd-D; Joseph I. Lieberman-ID
- Delaware: Thomas R. Carper-D; Edward E. Kaufman-D
- Florida: Mel Martinez-R; Bill Nelson-D
- Georgia: Saxby Chambliss-R; Johnny Isakson-R
- Hawaii: Daniel K. Akaka-D; Daniel K. Inouye-D
- Idaho: Mike Crapo-R; James E. Risch-R
- Illinois: Roland W. Burris-D; Richard J. Durbin-D
- Indiana: Evan Bayh-D; Richard G. Lugar-R
- Iowa: Chick Grassley-R; Tom Harkin-D
- Kansas: Sam Brownback-R; Pat Roberts-R
- Kentucky: Jim Bunning-R; Mitch McConnell-R
- Louisiana: Mary L. Landriu-D; David Vitter-R
- Maine: Susan M. Collins-R; Olympia J. Snowe-R
- Maryland: Benjamin L. Cardin-D; Barbara A. Mikulski-D
- Massachusetts: Edward M. Kennedy-D; John F. Kerry-D
- Michigan: Carl Levin-D; Debbie Stabenow-D
- Minnesota: Amy Klobuchar-D
- Mississippi: Thad Cochran-R; Roger F. Wicker-R
- Missouri: Christopher S. Bond-R; Claire McCaskill-D
- Montana: Max Baucus-D; Jon Tester-D
- Nebraska: Mike Johanns-R; Ben Nelson-D
- Nevada: John Ensign-R; Harry Reid-D
- New Hampshire: Judd Gregg-R; Jeanne Shaheen-D
- New Jersey: Frank R. Lautenberg-D; Robert Menendez-D
- New Mexico: Jeff Bingaman-D; Tom Udall-D
- New York: Kirsten E. Gillibrand-D; Charles E. Schumer-D
- North Carolina: Richard Burr-R; Kay R. Hagan-D
- North Dakota: Kent Conrad-D; Byron L. Dorgan-D
- Ohio: Sherrod Brown-D; George V. Voinovich-R
- Oklahoma: Tom Coburn-R; James M. Inhofe-R
- Oregon: Jeff Merkley-D; Ron Wyden-D
- Pennsylvania: Robert P. Casey, Jr.-D; Arlen Specter-D
- Rhode Island: Jack Reed-D; Sheldon Whitehouse-D
- South Carolina: Jim DeMint-R; Lindsey Graham-R
- South Dakota: Tim Johnson-D; John Thune-R
- Tennessee: Lamar Alexander-R; Bob Corker-R
- Texas: John Cornyn-R; Kay Bailey Hutchison-R
- Utah: Robert F. Bennett-R; Orrin G. Hatch-R
- Vermont: Patrick J. Leahy-D; Bernard Sanders-I
- Virginia: Mark R. Warner-D; Jim Webb-D
- Washington: Maria Cantwell-D; Patty Murray-D
- West Virginia: Robert C. Byrd-D; John D. Rockefeller, IV-D
- Wisconsin: Russell D. Feingold-D; Herb Kohl-D
- Wyoming: John Barrasso-R; Michael B. Enzi-R