| NRCC | $158K | 246 | 2002, 1996, 1994, 1992, 1998, 2004, 2012, 2008, 2000 |
| EMPLOYEES OF NORTHROP GRUMMAN CORPORATION PAC | $61K | 39 | 2010, 2002, 1996, 2006, 1998, 2004, 2012, 2008, 2000 |
| SEIU COPE (SERVICE EMPLOYEES INTERNATIONAL UNION COMMITTEE ON POLITICAL EDUCATION) | $58K | 3 | 2012 |
| NATIONAL ASSOCIATION OF REALTORS POLITICAL ACTION COMMITTEE | $58K | 32 | 2010, 2002, 1996, 1994, 2006, 1998, 2004, 2012, 2008, 2000 |
| RODPAC | $52K | 33 | 2012 |
| GENERAL DYNAMICS CORPORATION POLITICAL ACTION COMMITTEE (GENERAL DYNAMICS EMPLOYEE PAC) | $48K | 29 | 2010, 1996, 1994, 2014, 2006, 2004, 2012, 2008, 2000 |
| NATIONAL RIFLE ASSOCIATION OF AMERICA POLITICAL VICTORY FUND | $47K | 18 | 2002, 1996, 1994, 1998, 2004, 2012, 2008, 2000 |
| AMERICAN MEDICAL ASSOCIATION POLITICAL ACTION COMMITTEE | $41K | 17 | 2002, 1996, 1994, 2006, 1998, 2004, 2008, 2000 |
| LOCKHEED MARTIN CORPORATION EMPLOYEES' POLITICAL ACTION COMMITTEE | $40K | 36 | 2010, 1996, 2006, 1998, 2004, 2012, 2008, 2000 |
| NATIONAL AUTOMOBILE DEALERS ASSOCIATION POLITICAL ACTION COMMITTEE | $33K | 16 | 2010, 1996, 1994, 2006, 1992, 1998, 2004, 2012, 2000 |