Reply #17: Official site at senate.gov says 2007 [View All]

Apparently, Santorum's term runs until his successor takes office in January following the 2006 election. At http://www.senate.gov/general/contact_information/senators_cfm.cfm , click "WHAT IS A CLASS?" to get a comprehensive list:

"Senators of the 108th Congress, Listed by Class

Class I Senators Whose Terms of Service Expire in 2007
Class II Senators Whose Terms of Service Expire in 2009
Class III Senators Whose Terms of Service Expire in 2005
Article I, Section 3 of the Constitution of United States

CLASS I -- SENATORS WHOSE TERMS OF SERVICE EXPIRE IN 2007

REPUBLICANS
Allen, George
Burns, Conrad
Chafee, Lincoln
DeWine, Mike
Ensign, John
Frist, William
Hatch, Orrin
Hutchison, Kay Bailey
Kyl, Jon
Lott, Trent
Lugar, Richard
Santorum, Rick
Snowe, Olympia
Talent, Jim
Thomas, Craig

INDEPENDENTS
Jeffords, James

DEMOCRATS
Akaka, Daniel
Bingaman, Jeff
Byrd, Robert
Cantwell, Maria
Carper, Thomas
Clinton, Hillary
Conrad, Kent
Corzine, Jon
Dayton, Mark
Feinstein, Dianne
Kennedy, Edward
Kohl, Herb
Lieberman, Joseph
Nelson, Bill
Nelson, Ben
Sarbanes, Paul
Stabenow, Debbie"