| SEIU COPE (SERVICE EMPLOYEES INTERNATIONAL UNION COMMITTEE ON POLITICAL EDUCATION) | $657K | 17 | 2010, 2012, 2008 |
| 1199 SEIU UNITED HEALTHCARE WORKERS EAST FEDERAL POLITICAL ACTION FUND | $255K | 10 | 2008 |
| MOVEON.ORG POLITICAL ACTION | $159K | 7 | 2010, 2014, 2006, 2012, 2008 |
| EMILYS LIST | $107K | 9 | 2008 |
| CENTER FOR VOTER INFORMATION (CVI) | $88K | 5 | 2008 |
| LEAGUE OF CONSERVATION VOTERS INC | $86K | 81 | 2008 |
| UNITED FOOD AND COMMERCIAL WORKERS INTERNATIONAL UNION ACTIVE BALLOT CLUB | $54K | 19 | 2010, 2014, 2012, 2008 |
| MACHINISTS NON PARTISAN POLITICAL LEAGUE OF THE INTERNATIONAL ASSOCIATION OF MACHINISTS & AEROSPACE WORKERS | $50K | 10 | 2010, 2014, 2012, 2022, 2008 |
| SIERRA CLUB POLITICAL COMMITTEE | $49K | 28 | 2010, 2014, 2006, 2012, 2008 |
| AMERICAN ASSOCIATION FOR JUSTICE POLITICAL ACTION COMMITTEE (AAJ PAC) | $45K | 17 | 2010, 2014, 2012, 2022, 2008 |