| DSCC | $248K | 25 | 1988, 1994, 1996, 2000, 2012 |
| NEBRASKA DEMOCRATIC PARTY | $167K | 36 | 1988, 1994, 1996, 2012 |
| NEA FUND FOR CHILDREN AND PUBLIC EDUCATION | $39K | 17 | 1988, 1992, 1994, 1998, 2000, 2012 |
| INTERNATIONAL ASSOCIATION OF SHEET METAL, AIR, RAIL AND TRANSPORTATION WORKERS POLITICAL ACTION LEAGUE | $38K | 9 | 1988, 1994, 1996, 1998, 2000, 2012 |
| AMERICAN ASSOCIATION FOR JUSTICE POLITICAL ACTION COMMITTEE (AAJ PAC) | $35K | 14 | 1988, 1992, 1994, 1996, 1998, 2000, 2012 |
| COMMUNICATIONS WORKERS OF AMERICA - COPE POLITICAL CONTRIBUTIONS COMMITTEE | $32K | 12 | 1988, 1994, 1996, 1998, 2000, 2012 |
| D.R.I.V.E. - DEM, REP, IND VOTER ED (THE PAC OF THE INT'L BRHD OF TEAMSTERS) | $31K | 17 | 1988, 1992, 1994, 1998, 2000, 2012 |
| AMERICAN FEDERATION OF STATE COUNTY & MUNICIPAL EMPLOYEES P E O P L E | $30K | 9 | 1988, 1994, 1998, 2000, 2012 |
| MACHINISTS NON PARTISAN POLITICAL LEAGUE OF THE INTERNATIONAL ASSOCIATION OF MACHINISTS & AEROSPACE WORKERS | $30K | 10 | 1988, 1992, 1994, 2000 |
| INTERNATIONAL BROTHERHOOD OF ELECTRICAL WORKERS POLITICAL ACTION COMMITTEE | $30K | 13 | 1988, 1994, 1998, 2000, 2012 |