| INTERNATIONAL LONGSHOREMEN'S ASSOCIATION COMMITTEE ON POLITICAL EDUCATION | $105K | 23 | 2010, 2024, 2014, 2006, 2020, 2016, 2004, 2012, 2018, 2022, 2008 |
| NATIONAL ASSOCIATION OF REALTORS POLITICAL ACTION COMMITTEE | $95K | 40 | 2010, 2024, 2014, 2006, 2020, 2016, 2004, 2012, 2018, 2022, 2008 |
| MACHINISTS NON PARTISAN POLITICAL LEAGUE OF THE INTERNATIONAL ASSOCIATION OF MACHINISTS & AEROSPACE WORKERS | $94K | 22 | 2024, 2014, 2006, 2020, 2016, 2004, 2012, 2018, 2022, 2008 |
| COMMUNICATIONS WORKERS OF AMERICA - COPE POLITICAL CONTRIBUTIONS COMMITTEE | $78K | 23 | 2010, 2024, 2014, 2006, 2020, 2016, 2004, 2012, 2018, 2022, 2008 |
| AMERICAN FEDERATION OF STATE COUNTY & MUNICIPAL EMPLOYEES P E O P L E | $60K | 34 | 2010, 2024, 2014, 2006, 2020, 2016, 2004, 2012, 2018, 2022, 2008 |
| INTERNATIONAL BROTHERHOOD OF ELECTRICAL WORKERS POLITICAL ACTION COMMITTEE | $59K | 23 | 2010, 2024, 2014, 2006, 2016, 2004, 2012, 2022, 2008 |
| UA UNION PLUMBERS & PIPEFITTERS VOTE! PAC (UNITED ASSOCIATION OF JOURNEYMEN AND APPRENTICES OF THE PLUMBING & PIPEFITTING INDUSTRY OF THE UNITED STATES AND CANADA) | $56K | 15 | 2010, 2024, 2014, 2006, 2016, 2004, 2012, 2018, 2008 |
| UNITED STEELWORKERS POLITICAL ACTION FUND | $55K | 11 | 2010, 2006, 2020, 2016, 2004, 2012, 2018, 2022, 2008 |
| AT&T INC. EMPLOYEE FEDERAL POLITICAL ACTION COMMITTEE (AT&T EMPLOYEE FEDERAL PAC) | $53K | 22 | 2010, 2014, 2006, 2016, 2004, 2012, 2008 |
| MIDWEST REGION LABORERS' POLITICAL LEAGUE | $43K | 13 | 2010, 2014, 2016, 2012, 2008 |