| DSCC | $278K | 22 | 1990, 2006, 2008, 2000 |
| AMERICAN FEDERATION OF STATE COUNTY & MUNICIPAL EMPLOYEES P E O P L E | $136K | 11 | 1990, 1994, 2006, 1992, 2008, 2000 |
| AFL-CIO | $90K | 4 | 1994, 2006 |
| CARPENTERS LEGISLATIVE IMPROVEMENT COMMITTEE UNITED BROTHERHOOD OF CARPENTERS AND JOINERS | $54K | 10 | 1990, 1994, 2006, 1992, 2008, 2000 |
| INTERNATIONAL LONGSHORE AND WAREHOUSE UNION -- POLITICAL ACTION FUND | $46K | 34 | 1990, 1996, 1994, 2006, 1992, 2000 |
| AMERICAN ASSOCIATION FOR JUSTICE POLITICAL ACTION COMMITTEE (AAJ PAC) | $41K | 14 | 1990, 1994, 2006, 2008, 2000 |
| AIR LINE PILOTS ASSOCIATION PAC | $38K | 11 | 1990, 1994, 2006, 2008, 2000 |
| NEA FUND FOR CHILDREN AND PUBLIC EDUCATION | $37K | 15 | 1990, 1994, 2006, 1992, 2000 |
| MACHINISTS NON PARTISAN POLITICAL LEAGUE OF THE INTERNATIONAL ASSOCIATION OF MACHINISTS & AEROSPACE WORKERS | $35K | 11 | 1990, 1994, 2006, 2000 |
| NATIONAL ASSOCIATION OF LETTER CARRIERS OF U.S.A. POLITICAL FUND (LETTER CARRIER POLITICAL FUND) | $35K | 13 | 1990, 1994, 2006, 2000 |