The National Journal has put together a useful list based on objective study of voting records (the numbers indicate the ranking, including ties):
The 10 Most Liberal Senate Most Conservative Senate
1. Sherrod Brown (D-OH) 1. Jim Inhofe (R-OK)
1. Roland Burris (D-IL) 2. Jim DeMint (R-SC)
1. Ben Cardin (D-MD) 3. Jim Bunning (R-KY)
1. Jack Reed (D-RI) 4. Tom Coburn (R-OK)
1. Sheldon Whitehouse (D-RI) 5. Jim Risch (R-ID)
6. John Kerry (D-MA) 6. John Thune (R-SD)
6. Frank Lautenberg (D-NJ) 7. John Ensign (R-NV)
8. Barbara Mikulski (D-MD) 8. Mitch McConnell (R-KY)
9. Chris Dodd (D-CT) 9. Richard Burr (R-NC)
9. Dick Durbin (D-IL) 10. Jeff Sessions (R-AL)
The 10 Most Liberal House Most Conservative House
1. Rush Holt (D-NJ) 1. Trent Franks (R-AZ)
1. Gwen Moore (D-WI) 1. Doug Lamborn (R-CO)
1. John Olver (D-MA) 1. Randy Neugebaurer (R-TX)
1. Linda Sanchez (D-CA) 1. Pete Olson (R-TX)
1. Jan Schakowsky (D-IL) 1. John Shadegg (R-AZ)
1. Louise Slaughter (D-NY) 1. Mac Thornberry (R-TX)
1. Mel Watt (D-NC) 7. Marsha Blackburn (R-TN)
1. Henry Waxman (D-CA) 8. Mike Pence (R-IN)
9. Kathy Castor (D-FL) 9. Steve King (R-IA)
10. Jesse Jackson Jr. (D-IL) 9. Tom McClintock (R-CA)
Most Liberal House Delegations Most Conservative Delegations
1. MA 1. ID
2. HI 2. KY
3. VT 3. SC
4. CT 4. TX
5. RI 5. GA
via National Journal’s Vote Rankings: The Top 10 – Hotline On Call.
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