| DCCC | $500K | 58 | 2002, 1996, 2006, 1998, 2004, 2008, 2000 |
| AFL-CIO | $90K | 13 | 1996, 2006, 1998 |
| AMERICAN FEDERATION OF STATE COUNTY & MUNICIPAL EMPLOYEES P E O P L E | $72K | 29 | 2002, 1996, 2006, 1998, 2004, 2008, 2000 |
| AMERICAN FEDERATION OF TEACHERS, AFL-CIO COMMITTEE ON POLITICAL EDUCATION | $65K | 20 | 2002, 1996, 2006, 1998, 2004, 2008, 2000 |
| D.R.I.V.E. - DEMOCRAT, REPUBLICAN, INDEPENDENT VOTER EDUCATION (THE PAC OF THE INTERNATIONAL BROTHERHOOD OF TEAMSTERS) | $63K | 17 | 2002, 1996, 2006, 1998, 2004, 2008, 2000 |
| INTERNATIONAL BROTHERHOOD OF ELECTRICAL WORKERS POLITICAL ACTION COMMITTEE | $60K | 17 | 2002, 1996, 2006, 1998, 2004, 2008, 2000 |
| AMERICAN ASSOCIATION FOR JUSTICE POLITICAL ACTION COMMITTEE (AAJ PAC) | $60K | 19 | 2002, 1996, 2006, 1998, 2004, 2008, 2000 |
| NEA FUND FOR CHILDREN AND PUBLIC EDUCATION | $52K | 24 | 2002, 1996, 2006, 1998, 2004, 2000 |
| SEIU COPE (SERVICE EMPLOYEES INTERNATIONAL UNION COMMITTEE ON POLITICAL EDUCATION) | $51K | 17 | 2002, 1996, 2006, 1998, 2004, 2008, 2000 |
| AMERICAN BANKERS ASSOCIATION PAC (BANKPAC) | $50K | 35 | 2002, 1996, 2006, 1998, 2004, 2008, 2000 |