| WASHINGTON STATE DEMOCRATIC CENTRAL COMMITTEE | $1.1M | 124 | 2006, 2012, 2008, 2000 |
| NARAL PRO-CHOICE AMERICA | $219K | 39 | 2006, 2000 |
| SERVICE EMPLOYEES INTERNATIONAL UNION | $107K | 4 | 2006 |
| NATIONAL EDUCATION ASSOCIATION | $102K | 2 | 2006 |
| WASHINGTON STATE LABOR COUNCIL, AFL - CIO | $48K | 6 | 2000 |
| AMERICAN FEDERATION OF STATE, COUNTY AND MUNICIPAL EMPLOYEES, AFL-CIO | $40K | 2 | 2006 |
| INTERNATIONAL ASSOCIATION OF FIRE FIGHTERS | $29K | 8 | 2006, 2012, 2000 |
| LEAGUE OF CONSERVATION VOTERS ACTION FUND | $26K | 30 | 2006, 2018 |
| SIERRA CLUB | $25K | 1 | 2006 |
| PROGRESSIVE TURNOUT PROJECT | $23K | 4 | 2018 |