With retirement announcements from Sens. Kay Bailey Hutchison (R-TX), Joe Lieberman (I-CT) and Kent Conrad (D-ND), Jon Karl looks at the other senators most likely to retire rather than face re-election in 2012.
1. Sen. Daniel Akaka (D-HI)
2. Sen. Jim Webb (D-VA)
3. Sen. Jeff Bingaman (D-NM)
4. Sen. John Ensign (R-NV)
5. Sen. Jon Kyl (R-AZ)
6. Sen. Ben Nelson (D-NE)
7. Sen. Herb Kohl (D-WI)