| DSCC | $214K | 39 | 1980, 1982, 1986, 1992, 1994 |
| VERMONT DEMOCRATIC PARTY | $64K | 23 | 1986, 1998, 2004, 2010 |
| AMERICAN FEDERATION OF STATE COUNTY & MUNICIPAL EMPLOYEES P E O P L E | $51K | 25 | 1980, 1984, 1986, 1992, 2008, 2010, 2012, 2014, 2016, 2018, 2022 |
| AMERICAN FEDERATION OF TEACHERS, AFL-CIO COMMITTEE ON POLITICAL EDUCATION | $48K | 14 | 1980, 1986, 1992, 2004, 2006, 2010, 2016, 2022 |
| MACHINISTS NON PARTISAN POLITICAL LEAGUE OF THE INTERNATIONAL ASSOCIATION OF MACHINISTS & AEROSPACE WORKERS | $45K | 14 | 1980, 1986, 1992, 2004, 2010, 2016 |
| AMERICAN ASSOCIATION FOR JUSTICE POLITICAL ACTION COMMITTEE (AAJ PAC) | $45K | 20 | 1986, 1990, 1992, 2006, 2008, 2010, 2012, 2014, 2016, 2018, 2022 |
| VERMONT VICTORY 2004 | $44K | 2 | 2004 |
| INTERNATIONAL BROTHERHOOD OF ELECTRICAL WORKERS POLITICAL ACTION COMMITTEE | $44K | 18 | 1980, 1984, 1986, 1992, 2004, 2010, 2016, 2018 |
| ENGINEERS POLITICAL EDUCATION COMMITTEE (EPEC)/INTERNATIONAL UNION OF OPERATING ENGINEERS | $43K | 13 | 1980, 1986, 1992, 2010, 2016 |
| NEA FUND FOR CHILDREN AND PUBLIC EDUCATION | $35K | 19 | 1980, 1986, 1992, 1996, 1998, 2010, 2014, 2016, 2022 |