- Baucus (D-MT)
- Cardin (D-MD)
- Carper (D-DE)
- Conrad (D-ND)
- Dorgan (D-ND)
- Klobuchar (D-MN)
- Landrieu (D-LA)
- Lincoln (D-AR)
- McCaskill (D-MO)
- Mikulski (D-MD)
- Nelson (D-FL)
- Nelson (D-NE)
- Tester (D-MT)
- Webb (D-VA)
- Wyden (D-OR)
- Bennett (R-UT)
- Brownback (R-KS)
- Coleman (R-MN)
- Collins (R-ME)
- Hagel (R-NE)
- Lugar (R-IN)
- Murkowski (R-AK)
- Snowe (R-ME)
- Specter (R-PA)
- Warner (R-VA)