US Senators up for reelection in 2006:

Akaka (D-HI)
Allen (R-VA)
Bingaman (D-NM)
Burns (R-MT)
Byrd (D-WV)
Cantwell (D-WA)
Carper (D-DE)
Chafee (R-RI)
Clinton (D-NY)
Conrad (D-ND)
Dayton (D-MN)
DeWine (R-OH)
Ensign (R-NV)
Feinstein (D-CA)
Frist (R-TN)
Hatch (R-UT)
Hutchison (R-TX)
Jeffords (I-VT)
Kennedy (D-MA)
Kohl (D-WI)
Kyl (R-AZ)
Lieberman (D-CT)
Lott (R-MS)
Lugar (R-IN)
Nelson (D-FL)
Nelson (D-NE)
Santorum (R-PA)
Sarbanes (D-MD)
Snowe (R-ME)
Stabenow (D-MI)
Talent (R-MO)
Thomas (R-WY)

New Jersey's new US senator will also be up for reelection.

According to information at a website Senators Dayton, Frist, Jeffords, and Sarbanes will not seek reelection in 2006.