| DCCC | $126K | 51 | 2002, 1996, 1994, 1992, 2004, 2008, 2000 |
| LOS ANGELES COUNTY FEDERATION OF LABOR, AFL-CIO | $92K | 2 | 2000 |
| EMPLOYEES OF NORTHROP GRUMMAN CORPORATION PAC | $90K | 32 | 2010, 2002, 1996, 1994, 2006, 1992, 1998, 2004, 2008, 2000 |
| NATIONAL ASSOCIATION OF REALTORS POLITICAL ACTION COMMITTEE | $71K | 45 | 2010, 2002, 1996, 1994, 2006, 1998, 2004, 2008, 2000 |
| CARPENTERS LEGISLATIVE IMPROVEMENT COMMITTEE UNITED BROTHERHOOD OF CARPENTERS AND JOINERS | $63K | 19 | 2010, 2002, 1996, 1994, 2006, 2004, 2000 |
| SEIU COPE (SERVICE EMPLOYEES INTERNATIONAL UNION COMMITTEE ON POLITICAL EDUCATION) | $63K | 22 | 2010, 2002, 1996, 1994, 2006, 1998, 2004, 2008, 2000 |
| NEA FUND FOR CHILDREN AND PUBLIC EDUCATION | $62K | 25 | 2010, 2002, 1996, 1994, 2006, 1992, 1998, 2004, 2008, 2000 |
| UNITED FOOD AND COMMERCIAL WORKERS INTERNATIONAL UNION ACTIVE BALLOT CLUB | $61K | 17 | 2010, 2002, 1996, 1994, 2006, 1992, 2004, 2000 |
| INTERNATIONAL BROTHERHOOD OF ELECTRICAL WORKERS POLITICAL ACTION COMMITTEE | $60K | 20 | 2010, 2002, 1996, 1994, 1992, 2008, 2000 |
| BLUE DOG POLITICAL ACTION COMMITTEE | $60K | 12 | 2010, 2002, 2006, 2004, 2008, 2000 |