| AMERICAN FEDERATION OF TEACHERS, AFL-CIO COMMITTEE ON POLITICAL EDUCATION | $118K | 42 | 2010, 1990, 2002, 1996, 2024, 1994, 2014, 2006, 1992, 2020, 1998, 2016, 2004, 2012, 2018, 2022, 2008, 2000 |
| NATIONAL ASSOCIATION OF REALTORS POLITICAL ACTION COMMITTEE | $107K | 48 | 2010, 2002, 2024, 1994, 2014, 2006, 1992, 2020, 1998, 2016, 2004, 2012, 2018, 2022, 2008, 2000 |
| SMART TD PAC | $94K | 27 | 2010, 2002, 1996, 2024, 1994, 2014, 2006, 2020, 1998, 2016, 2004, 2012, 2018, 2022, 2008, 2000 |
| MACHINISTS NON PARTISAN POLITICAL LEAGUE OF THE INTERNATIONAL ASSOCIATION OF MACHINISTS & AEROSPACE WORKERS | $92K | 26 | 2010, 1990, 2024, 2014, 2006, 1992, 2020, 1998, 2016, 2004, 2012, 2018, 2022, 2008, 2000 |
| CARPENTERS LEGISLATIVE IMPROVEMENT COMMITTEE UNITED BROTHERHOOD OF CARPENTERS AND JOINERS | $81K | 23 | 2010, 1990, 2002, 2024, 2014, 2006, 2020, 2004, 2012, 2018, 2022, 2008 |
| AMERICAN FEDERATION OF STATE COUNTY & MUNICIPAL EMPLOYEES P E O P L E | $78K | 45 | 2010, 1990, 2002, 1996, 2024, 1994, 2014, 2006, 1992, 2020, 1998, 2016, 2004, 2012, 2018, 2022, 2008, 2000 |
| ENGINEERS POLITICAL EDUCATION COMMITTEE (EPEC)/INTERNATIONAL UNION OF OPERATING ENGINEERS | $73K | 22 | 2010, 2024, 2014, 2006, 2020, 2016, 2012, 2018, 2022, 2008 |
| LABORERS' INTERNATIONAL UNION OF NORTH AMERICA (LIUNA) PAC | $70K | 37 | 2002, 1996, 2014, 2006, 1992, 2020, 1998, 2016, 2004, 2012, 2018, 2022, 2008, 2000 |
| AMERICAN POSTAL WORKERS UNION COMMITTEE ON POLITICAL ACTION | $68K | 33 | 1990, 2002, 2024, 1994, 2014, 2006, 1992, 2020, 1998, 2016, 2004, 2012, 2018, 2022, 2008, 2000 |
| AMALGAMATED TRANSIT UNION - COPE | $60K | 20 | 2010, 2024, 1994, 2014, 1992, 2020, 2016, 2012, 2018, 2022, 2008 |