| Rank | Last | Race | Projection | Rating |
| Extremely Vulnerable |
| 1 | 1 | Pennsylvania | Bob Casey, Jr. over Rick Santorum | Weak DEM Gain |
| 2 | 2 | Montana | Jon Tester over Conrad Burns | Weak DEM Gain |
| 3 | 3 | Missouri | Jim Talent over Claire McCaskill | Weak GOP Hold |
| Highly Vulnerable |
| 4 | 4 | Rhode Island | Lincoln Chafee over Sheldon Whitehouse | Weak GOP Hold |
| 5 | 5 | Ohio | Mike DeWine over Sherrod Brown | DeWine +3.7 |
| 6 | 6 | Minnesota | Amy Klobuchar over Mark Kennedy | Weak DEM Hold |
| Moderately Vulnerable |
| 7 | 7 | Washington | Maria Cantwell over Mike McGavick | Weak DEM Hold |
| 8 | 8 | New Jersey | Robert Menendez over Tom Kean, Jr. | Weak DEM Hold |
| Mildly Vulnerable |
| 9 | 9 | Michigan | Debbie Stabenow over Bouchard or Butler | Weak DEM Hold |
| 10 | 10 | Nebraska | Ben Nelson over Peter Ricketts | Weak DEM Hold |
| 11 | 11 | Tennessee | Bryant/Corker/Hilleary over Harold Ford | Weak GOP Hold |
| 12 | 12 | Maryland | Ben Cardin over Michael Steele | Weak DEM Hold |
| Slightly Vulnerable |
| 13 | 14 | Arizona | Jon Kyl over Jim Pederson | Strong GOP Hold |
| 14 | 13 | Nevada | John Ensign over Jack Carter | Strong GOP Hold |
| 15 | 15 | Wisconsin | Herb Kohl over Tim Michels | Strong DEM Hold |
| 16 | 16 | Florida | Bill Nelson over Katherine Harris | Strong DEM Hold |
| Not Vulnerable |
| 17 | 17 | West Virginia | Robert Byrd over ??? | Strong DEM Hold |
| 18 | 18 | Virginia | George Allen over James Webb, Jr. | Strong GOP Hold |
| 19 | 19 | New Mexico | Jeff Bingaman over Tom Binavides | Strong DEM Hold |
| 20 | 20 | Connecticut | Joeseph Lieberman over ??? | Strong DEM Hold |
| 21 | 21 | Hawaii | Daniel Akaka over ??? | Strong DEM Hold |
| 22 | 22 | Maine | Olympia Snowe over Eric Mehnert | Strong GOP Hold |
| Set in Stone |
| 23 | 23 | North Dakota | Kent Conrad over Dwight Grotberg | Strong DEM Hold |
| 24 | 25 | Vermont | Bernie Sanders over Park and Drown | Strong IND Hold |
| 25 | 26 | California | Dianne Feinstein over Bill Mundell | Strong DEM Hold |
| 26 | 27 | New York | Hillary Clinton over Spencer or McFarland | Strong DEM Hold |
| 27 | 28 | Utah | Orrin Hatch over Pete Ashdown | Strong GOP Hold |
| 28 | 29 | Texas | Kay Hutchison over Barbara Radnofsky | Strong GOP Hold |
| 29 | 30 | Mississippi | Trent Lott over Erik Fleming | Strong GOP Hold |
| 30 | 24 | Indiana | Richard Lugar - unopposed | Strong GOP Hold |
| 31 | 31 | Delaware | Tom Carper over Jan Ting | Strong DEM Hold |
| 32 | 32 | Wyoming | Craig Thomas over Dale Groutage | Strong GOP Hold |
| 33 | 33 | Massachusetts | Ted Kennedy over Chase or Scott | Strong DEM Hold |