DEMOCRATS                                         
Max Baucus (Montana)*                               
Mark Begich (Alaska)                                 
Chris Coons (Delaware)                              
William "Mo" Cowan (Massachusetts) - Appointee retiring, to be succeeded in June, 2013
Richard Durbin (Illinois)                               
Al Franken (Minnesota)                               
Kay Hagan (North Carolina)                        
Tom Harkin (Iowa)*                                      
Tim Johnson (South Dakota) *                                                
Mary Landrieu (Louisiana)                           
Frank Lautenberg (New Jersey)*                   
Carl Levin (Michigan)*                                   
Jeff Merkley (Oregon)                                                     
Mark Pryor (Arkansas)                                               
Jack Reed (Rhode Island)
John Rockefeller (West Virginia)*
Jeanne Shaheen (New Hampshire)
Mark Udall (Colorado)
Tom Udall (New Mexico)
Mark Warner (Virginia)

 

REPUBLICANS

Lamar Alexander (Tennessee)
Saxby Chambliss (Georgia)*
Thad Cochran (Mississippi)
Susan Collins (Maine)
John Cornyn (Texas)
Michael Enzi (Wyoming)
Lindsey Graham (South Carolina)
James Inhofe (Oklahoma)
Mike Johanns (Nebraska)*
Mitch McConnell (Kentucky)
James Risch (Idaho)
Pat Roberts (Kansas)
Jeff Sessions (Alabama)     

*Retiring in 2014