| DCCC | $98K | 124 | 2010, 2002, 1994, 2006, 1992, 1998, 2004, 2012, 2008, 2000 |
| AMERICAN FEDERATION OF STATE COUNTY & MUNICIPAL EMPLOYEES P E O P L E | $84K | 31 | 2010, 2002, 1994, 2006, 1992, 1998, 2004, 2012, 2008, 2000 |
| INTERNATIONAL BROTHERHOOD OF ELECTRICAL WORKERS POLITICAL ACTION COMMITTEE | $82K | 24 | 2010, 2002, 1994, 2006, 1992, 1998, 2004, 2012, 2008, 2000 |
| AMERICAN ASSOCIATION FOR JUSTICE POLITICAL ACTION COMMITTEE (AAJ PAC) | $80K | 27 | 2010, 2002, 1994, 2006, 1992, 1998, 2004, 2008, 2000 |
| WASHINGTON STATE DEMOCRATIC CENTRAL COMMITTEE | $79K | 21 | 2010, 2006, 1992, 1998, 2012, 2000 |
| MACHINISTS NON PARTISAN POLITICAL LEAGUE OF THE INTERNATIONAL ASSOCIATION OF MACHINISTS & AEROSPACE WORKERS | $76K | 19 | 2010, 2002, 1994, 2006, 1992, 1998, 2004, 2008, 2000 |
| MICROSOFT CORPORATION STAKEHOLDERS VOLUNTARY PAC - MSVPAC | $63K | 40 | 2010, 2002, 1994, 2006, 2004, 2012, 2008, 2000 |
| WASHINGTON STATE LABOR COUNCIL, AFL - CIO | $59K | 23 | 1994, 1998, 2000 |
| D.R.I.V.E. - DEMOCRAT, REPUBLICAN, INDEPENDENT VOTER EDUCATION (THE PAC OF THE INTERNATIONAL BROTHERHOOD OF TEAMSTERS) | $59K | 17 | 2010, 2002, 1994, 2006, 1992, 1998, 2004, 2008, 2000 |
| SEIU COPE (SERVICE EMPLOYEES INTERNATIONAL UNION COMMITTEE ON POLITICAL EDUCATION) | $59K | 20 | 2010, 2002, 2006, 1992, 1998, 2004, 2012, 2008, 2000 |