| DSCC | $278K | 22 | 1990, 2000, 2006, 2008 |
| INTERNATIONAL LONGSHORE AND WAREHOUSE UNION -- POLITICAL ACTION FUND | $45K | 22 | 1990, 1992, 1994, 1996, 2000, 2006 |
| AMERICAN ASSOCIATION FOR JUSTICE POLITICAL ACTION COMMITTEE (AAJ PAC) | $41K | 14 | 1990, 1994, 2000, 2006, 2008 |
| AIR LINE PILOTS ASSOCIATION PAC | $38K | 11 | 1990, 1994, 2000, 2006, 2008 |
| NEA FUND FOR CHILDREN AND PUBLIC EDUCATION | $37K | 15 | 1990, 1992, 1994, 2000, 2006 |
| AMERICAN FEDERATION OF STATE COUNTY & MUNICIPAL EMPLOYEES P E O P L E | $36K | 10 | 1990, 1992, 1994, 2000, 2006, 2008 |
| MACHINISTS NON PARTISAN POLITICAL LEAGUE OF THE INTERNATIONAL ASSOCIATION OF MACHINISTS & AEROSPACE WORKERS | $35K | 11 | 1990, 1994, 2000, 2006 |
| NATIONAL ASSOCIATION OF LETTER CARRIERS OF U.S.A. POLITICAL FUND (LETTER CARRIER POLITICAL FUND) | $35K | 13 | 1990, 1994, 2000, 2006 |
| INTERNATIONAL ASSOCIATION OF SHEET METAL, AIR, RAIL AND TRANSPORTATION WORKERS POLITICAL ACTION LEAGUE | $33K | 9 | 1990, 1992, 1994, 2000, 2002, 2006, 2008 |
| SEAFARERS POLITICAL ACTIVITY DONATION - SEAFARERS INTERNATIONAL UNION OF NA-AGLIW | $32K | 10 | 1990, 1992, 2000, 2006, 2010 |