Senate

Solid Democratic (8)

• Gillibrand (New York)
• Open Hawaii (Akaka)
• Sanders (Vermont)*
• Carper (Delaware)
• Cardin (Maryland)
• Klobuchar (Minnesota)
• Feinstein (California)
• Whitehouse (Rhode Island)
  
  

Likely Democratic (6)

• Menendez (New Jersey)
• Manchin (West Virginia)
• Casey (Pennsylvania)
• Open New Mexico (Bingaman)
• Cantwell (Washington)
• Open Connecticut (Lieberman)
  
  

Leans Democratic (4)

• Brown (Ohio)
• Bill Nelson (Florida)
• Stabenow (Michigan)
• 
  

Toss-ups (7)

• Tester (Montana)
• McCaskill (Missouri) 
• Open Wisconsin (Kohl) 
• Open Virginia (Webb)
• Open North Dakota (Conrad) 
  
• Ensign (Nevada)
  
• Brown (Massachusetts)
• Snowe (Maine)***

Leans Republican (2)

• Open Arizona (Kyl)
• Open Nebraska (Nelson)
  
  

Likely Republican (2)

• Lugar (Indiana) 
• Open Texas (Bailey-Hutchison)

Safe Republican (4)

• Hatch (Utah)
• Barrasso (Wyoming)
• Wicker (Mississippi)
• Corker (Tennessee)

(Updates)
(2/29/2012) Moved ME-Sen from Likely R to Leans D based on Olympia Snowe's retirement, and NE-Sen from Safe R to Leans R with Bob Kerrey's run for Senate.
(12/22/2011) Updated WI-Sen (Likely D to Toss-up), ND-Sen (Leans R to Toss-up), and TN-Sen (Likely R to Safe R)
(3/6/2011) Created 2012 list.


***ME-Sen is ranked as Leans Independent, but toss-up because it's not clear whether King will caucus with anyone or not.