| DSCC | $214K | 39 | 1994, 1992, 1980, 1986, 1982 |
| AUTO DEALERS AND DRIVERS FOR FREE TRADE PAC | $127K | 10 | 1984, 1986 |
| VERMONT DEMOCRATIC PARTY | $64K | 23 | 2010, 1998, 2004, 1986 |
| AMERICAN FEDERATION OF STATE COUNTY & MUNICIPAL EMPLOYEES P E O P L E | $51K | 25 | 2010, 2014, 1992, 1984, 1980, 2016, 2012, 2018, 2022, 2008, 1986 |
| AMERICAN FEDERATION OF TEACHERS, AFL-CIO COMMITTEE ON POLITICAL EDUCATION | $48K | 14 | 2010, 2006, 1992, 1980, 2016, 2004, 2022, 1986 |
| MACHINISTS NON PARTISAN POLITICAL LEAGUE OF THE INTERNATIONAL ASSOCIATION OF MACHINISTS & AEROSPACE WORKERS | $45K | 14 | 2010, 1992, 1980, 2016, 2004, 1986 |
| AMERICAN ASSOCIATION FOR JUSTICE POLITICAL ACTION COMMITTEE (AAJ PAC) | $45K | 20 | 2010, 1990, 2014, 2006, 1992, 2016, 2012, 2018, 2022, 2008, 1986 |
| VERMONT VICTORY 2004 | $44K | 2 | 2004 |
| INTERNATIONAL BROTHERHOOD OF ELECTRICAL WORKERS POLITICAL ACTION COMMITTEE | $44K | 18 | 2010, 1992, 1984, 1980, 2016, 2004, 2018, 1986 |
| ENGINEERS POLITICAL EDUCATION COMMITTEE (EPEC)/INTERNATIONAL UNION OF OPERATING ENGINEERS | $43K | 13 | 2010, 1992, 1980, 2016, 1986 |