National Journal:
Most liberal senators, lifetime voting*

1. Mark Dayton, D-Minn.
2. Paul Sarbanes, D-Md.
3. Jack Reed, D-R.I.
4. Jon Corzine, D-N.J.
5. Edward Kennedy, D-Mass.
6. Barbara Boxer, D-Calif.
7. Tom Harkin, D-Iowa
8. Richard Durbin, D-Ill.
9. Frank Lautenberg, D-N.J.
10. Patrick Leahy, D-Vt

* reference: National Journal published 3/6/04, p. 679