Democrats participating in 03-S1411 | ||
| Barbara Boxer | s1o | CA Democratic incumbent |
| John Breaux | s1o | LA Former Democratic incumbent; retired 2004 |
| Hillary Clinton | s1o | NY Democrat Jr Senator |
| Jon Corzine | s1o | NJ Democrat |
| Mark Dayton | s1o | MN Democrat Jr Senator |
| Chris Dodd | s1o | CT Democratic incumbent |
| Richard Durbin | s1o | IL Democrat Sr Senator |
| Tim Johnson | s1o | SD Democrat Sr Senator |
| Ted Kennedy | s1o | MA Democrat Sr Senator |
| John Kerry | s1i | MA Democrat Jr Senator |
| Mary Landrieu | s1o | LA Democrat Sr Senator |
| Frank Lautenberg | s1o | NJ Democrat Sr Senator |
| Patrick Leahy | s1o | VT Democratic incumbent |
| Joseph Lieberman | s1o | CT Democratic Jr Senator; Gore's VP nominee; ran for Pres. 2004 |
| Patty Murray | s1o | WA Democratic incumbent |
| Bill Nelson | s1o | FL Democrat Sr Senator |
| Jack Reed | s1o | RI Democrat Sr Senator |
| Paul Sarbanes | s1o | MD Democrat Sr Senator |
| Charles Schumer | s1o | NY Democratic incumbent |
| Debbie Stabenow | s1o | MI Democrat Jr Senator |
Republicans participating in 03-S1411 | ||
| Lincoln Chafee | s1o | RI Republican Jr Senator |
Independents participating in 03-S1411 | ||
| Jim Jeffords | s1o | VT Independent Jr Senator |
| Democrats:
20
Republicans: 1 Independents: 1 |