Bayh, Evan (D-IN)
Biden, Joseph R., Jr. (D-DE)
Boxer, Barbara (D-CA)
Clinton, Hillary Rodham (D-NY)
Dayton, Mark (D-MN)
Dodd, Christopher J. (D-CT)
Durbin, Richard (D-IL)
Feingold, Russell D. (D-WI)
Feinstein, Dianne (D-CA)
Jeffords, James M. (I-VT)
Kennedy, Edward M. (D-MA)
Kerry, John F. (D-MA)
Lautenberg, Frank R. (D-NJ)
Leahy, Patrick J. (D-VT)
Levin, Carl (D-MI)
Menendez, Robert (D-NJ)
Mikulski, Barbara A. (D-MD)
Murray, Patty (D-WA)
Obama, Barack (D-IL)
Reed, Jack (D-RI)
Reid, Harry (D-NV)
Sarbanes, Paul S. (D-MD)
Schumer, Charles E. (D-NY)
Stabenow, Debbie (D-MI)
Wyden, Ron (D-OR)
No matter what their motives for doing so they did the right thing.
Of them, those facing re-election in 2006 (I think I've got them all - someone correct me if I screwed up here):
Debbie Stabenow.
Edward Kennedy.
Dianne Feinstein.
Hillary Clinton.
Bob Menendez.
It's an interesting list, really, given those who are running in 2006 (note this list is a bit out of date and also note retirements, but it gives a flavor).
The electoral calculus is clear. Dems are up several-dozen points in a generic ballot. Bush is at 40ish% approval. And they still all fear Radical Mullah Dobson.