| AMERICAN CROSSROADS | $534K | 4 | 2010 |
| DCCC | $232K | 76 | 2010, 2002, 1996, 1994, 1992, 1998, 2012, 2000 |
| MACHINISTS NON PARTISAN POLITICAL LEAGUE OF THE INTERNATIONAL ASSOCIATION OF MACHINISTS & AEROSPACE WORKERS | $92K | 37 | 2010, 2002, 1996, 1994, 2006, 1992, 1998, 2004, 2012, 2008, 2000 |
| AMERICAN ASSOCIATION FOR JUSTICE POLITICAL ACTION COMMITTEE (AAJ PAC) | $91K | 43 | 2010, 2002, 1996, 1994, 2006, 1992, 1998, 2004, 2012, 2008, 2000 |
| AMERICAN FEDERATION OF STATE COUNTY & MUNICIPAL EMPLOYEES P E O P L E | $91K | 46 | 2010, 2002, 1996, 1994, 2006, 1992, 1998, 2004, 2012, 2008, 2000 |
| INTERNATIONAL BROTHERHOOD OF ELECTRICAL WORKERS POLITICAL ACTION COMMITTEE | $81K | 56 | 2010, 2002, 1996, 1994, 2006, 1992, 1998, 2004, 2012, 2008, 2000 |
| AMERICAN FEDERATION OF TEACHERS, AFL-CIO COMMITTEE ON POLITICAL EDUCATION | $80K | 47 | 2010, 2002, 1996, 1994, 2006, 1992, 1998, 2004, 2012, 2008, 2000 |
| LABORERS' INTERNATIONAL UNION OF NORTH AMERICA (LIUNA) PAC | $80K | 42 | 2010, 2002, 1996, 1994, 2006, 1998, 2004, 2008, 2000 |
| D.R.I.V.E. - DEMOCRAT, REPUBLICAN, INDEPENDENT VOTER EDUCATION (THE PAC OF THE INTERNATIONAL BROTHERHOOD OF TEAMSTERS) | $75K | 39 | 2010, 2002, 1996, 1994, 2006, 1992, 1998, 2004, 2008, 2000 |
| UAW - V - CAP (UAW VOLUNTARY COMMUNITY ACTION PROGRAM) 'INT'L UNION UNITED AUTOMOBILE AEROSPACE & AGRICULTURAL IMPLEMENT WORKERS OF AMERICA UAW | $72K | 63 | 2010, 2002, 1996, 1994, 2006, 1998, 2004, 2008, 2000 |