| AMERICAN FEDERATION OF TEACHERS, AFL-CIO COMMITTEE ON POLITICAL EDUCATION | $144K | 63 | 2010, 1990, 2002, 1996, 1994, 2014, 2006, 1992, 2020, 1988, 1998, 2016, 2004, 2012, 2018, 2008, 2000 |
| AMERICAN ASSOCIATION FOR JUSTICE POLITICAL ACTION COMMITTEE (AAJ PAC) | $135K | 59 | 2010, 1990, 2002, 1996, 1994, 2014, 2006, 1992, 2020, 1988, 1998, 2016, 2004, 2012, 2018, 2008, 2000 |
| NATIONAL ASSOCIATION OF REALTORS POLITICAL ACTION COMMITTEE | $116K | 70 | 2010, 1990, 2002, 1996, 1994, 2014, 2006, 1992, 2020, 1998, 2016, 2004, 2012, 2018, 2008, 2000 |
| NEA FUND FOR CHILDREN AND PUBLIC EDUCATION | $113K | 50 | 2010, 1990, 2002, 1996, 1994, 2014, 2006, 1992, 2020, 1988, 1998, 2016, 2004, 2012, 2018, 2008, 2000 |
| AMERICAN FEDERATION OF STATE COUNTY & MUNICIPAL EMPLOYEES P E O P L E | $112K | 69 | 2010, 1990, 2002, 1996, 1994, 2014, 2006, 1992, 2020, 1988, 1998, 2016, 2004, 2012, 2018, 2008, 2000 |
| LABORERS' INTERNATIONAL UNION OF NORTH AMERICA (LIUNA) PAC | $104K | 47 | 2010, 1990, 2002, 1996, 1994, 2014, 2006, 1992, 1998, 2016, 2004, 2012, 2018, 2008, 2000 |
| AMERICAN HOSPITAL ASSOCIATION PAC | $91K | 61 | 2010, 1990, 2002, 1996, 1994, 2014, 2006, 1992, 1998, 2016, 2004, 2012, 2018, 2008, 2000 |
| AMERICAN DENTAL ASSOCIATION POLITICAL ACTION COMMITTEE | $83K | 57 | 2010, 1990, 2002, 1996, 1994, 2014, 2006, 1992, 2020, 1998, 2016, 2004, 2012, 2018, 2008, 2000 |
| SEIU COPE (SERVICE EMPLOYEES INTERNATIONAL UNION COMMITTEE ON POLITICAL EDUCATION) | $81K | 28 | 2010, 1990, 2002, 1994, 2014, 2006, 1992, 2020, 1988, 1998, 2016, 2004, 2018, 2008, 2000 |
| NATIONAL ASSOCIATION OF LETTER CARRIERS OF U.S.A. POLITICAL FUND (LETTER CARRIER POLITICAL FUND) | $80K | 35 | 2010, 1990, 2002, 1996, 1994, 2014, 2006, 1992, 2020, 1998, 2016, 2004, 2012, 2018, 2008, 2000 |