| Alabama | Jeff Sessions,
Richard Shelby | | |
| Alaska | | Lisa Murkowski,
Ted Stevens | |
| Arizona | | Jon Kyl | John McCain |
| Arkansas | Mark Pryor | Blanche Lincoln | |
| California | | Barbara Boxer,
Dianne Feinstein | |
| Colorado | Wayne Allard | Kenneth Salazar | |
| Connecticut | | | Chris Dodd,
Joseph Lieberman |
| Delaware | | Joe Biden,
Tom Carper | |
| Florida | | Mel Martinez,
Bill Nelson | |
| Georgia | | Saxby Chambliss,
Johnny Isakson | |
| Hawaii | | Daniel Akaka,
Daniel Inouye | |
| Idaho | | Larry Craig,
Mike Crapo | |
| Illinois | | Dick Durbin | Barack Obama |
| Indiana | | Evan Bayh,
Richard Lugar | |
| Iowa | Chuck Grassley | Tom Harkin | |
| Kansas | Pat Roberts | | Sam Brownback |
| Kentucky | Jim Bunning,
Mitch McConnell | | |
| Louisiana | Mary Landrieu,
David Vitter | | |
| Maine | | Susan Collins,
Olympia Snowe | |
| Maryland | | Ben Cardin,
Barbara Mikulski | |
| Massachusetts | | Edward Kennedy,
John Kerry | |
| Michigan | | Carl Levin,
Debbie Stabenow | |
| Minnesota | | Norm Coleman,
Amy Klobuchar | |
| Mississippi | | Thad Cochran,
Trent Lott | |
| Missouri | Kit Bond,
Claire McCaskill | | |
| Montana | | Max Baucus,
Jon Tester | |
| Nebraska | Ben Nelson | Chuck Hagel | |
| Nevada | John Ensign | Harry Reid | |
| New Hampshire | Judd Gregg,
John Sununu | | |
| New Jersey | | Frank Lautenberg,
Robert Menendez | |
| New Mexico | | Jeff Bingaman,
Pete Domenici | |
| New York | | Hillary Clinton,
Chuck Schumer | |
| North Carolina | Richard Burr,
Liddy Dole | | |
| North Dakota | Kent Conrad,
Byron Dorgan | | |
| Ohio | | Sherrod Brown,
George Voinovich | |
| Oklahoma | Tom Coburn,
James Inhofe | | |
| Oregon | | Gordon Smith,
Ron Wyden | |
| Pennsylvania | | Bob Casey,
Arlen Specter | |
| Rhode Island | | Jack Reed,
Sheldon Whitehouse | |
| South Carolina | Jim DeMint | Lindsey Graham | |
| South Dakota | John Thune | | Tim Johnson |
| Tennessee | Lamar Alexander,
Bob Corker | | |
| Texas | John Cornyn,
Kay Bailey Hutchison | | |
| Utah | | Bob Bennett,
Orrin Hatch | |
| Vermont | | Patrick Leahy,
Bernard Sanders | |
| Virginia | | John Warner,
Jim Webb | |
| Washington | | Maria Cantwell,
Patty Murray | |
| West Virginia | Robert Byrd,
Jay Rockefeller | | |
| Wisconsin | | Russ Feingold,
Herb Kohl | |
| Wyoming | Mike Enzi | | |