Donations can be made to political candidates in various amounts. The FEC regulates these donations, and individual groups, excluding PACs, must disclose donations over $250 per year.
The following table lists top 100 contributions donated to Tammy L. Duckworth's campaign in September.
| Rank | Contributor | Amount |
|---|---|---|
| 1 | Arminius Bucher | $4,100 |
| 2 | Barry Boehm | $3,500 |
| 3 | Polly O'Brien | $2,800 |
| 3 | Alejandro Foung | $2,800 |
| 3 | Chris Stolte | $2,800 |
| 3 | Bill Gates | $2,800 |
| 3 | Andra Rush | $2,800 |
| 8 | Charles Raymond | $2,600 |
| 9 | David Ravenhall | $2,500 |
| 9 | Carl Scott Autrey | $2,500 |
| 11 | Peter Vanderlugt | $1,500 |
| 12 | Mark Demich | $1,400 |
| 13 | Stephen L. Ondra | $1,100 |
| 14 | Michael Mcquillen | $1,000 |
| 14 | Thomas Lindsey | $1,000 |
| 14 | Patricia Highberg | $1,000 |
| 14 | Douglas Kinney | $1,000 |
| 14 | John Vottero | $1,000 |
| 14 | Leslie Anne Miller | $1,000 |
| 14 | Philip Gray | $1,000 |
| 14 | Walter White | $1,000 |
| 14 | William R. Padnos | $1,000 |
| 14 | Jane Helms | $1,000 |
| 14 | Amir Azarbad | $1,000 |
| 14 | Roger Baker | $1,000 |
| 14 | Ronald B. Port | $1,000 |
| 14 | Peter Levin | $1,000 |
| 14 | Timothy J. Disney | $1,000 |
| 14 | Richard Kopcho | $1,000 |
| 14 | Nicholas Gross | $1,000 |
| 14 | William Gould | $1,000 |
| 14 | Jessica Garascia | $1,000 |
| 33 | Judy M. Judd | $800 |
| 33 | Himi T. Kim | $800 |
| 35 | Thomas Carroll | $700 |
| 36 | William Reddy | $600 |
| 36 | Nicki Gamble | $600 |
| 38 | Alton Lauver | $550 |
| 39 | Gene Hoffman | $505 |
| 40 | Priscilla E. Browning | $500 |
| 40 | Leon Bell | $500 |
| 40 | John B. Cooper | $500 |
| 40 | Eric Young | $500 |
| 40 | Kathleen Campbell | $500 |
| 40 | Ruth Hafter | $500 |
| 40 | John Schilbe | $500 |
| 40 | Claudia Foulke | $500 |
| 40 | Benedict Cozzi | $500 |
| 40 | Alice Karoub | $500 |
| 40 | Lieselotte N. Betterman | $500 |
| 40 | Robert T. Byington | $500 |
| 40 | Barbara Fritch | $500 |
| 40 | Robert Nussbaum | $500 |
| 40 | Brien Stafford | $500 |
| 40 | Paul Kelly | $500 |
| 40 | Irma Rendina | $500 |
| 40 | Melinda Peterson | $500 |
| 40 | Daniel Kramer | $500 |
| 40 | Felicia May | $500 |
| 40 | Robert Hutchins | $500 |
| 40 | Sonce Devries | $500 |
| 40 | Kenneth Fisher | $500 |
| 40 | Robert Kennedy | $500 |
| 40 | Tina Kroot | $500 |
| 40 | Charles Press | $500 |
| 40 | Barbara Gross | $500 |
| 40 | Edward Weisberger | $500 |
| 40 | Rahul Ghai | $500 |
| 40 | Roy Miyamoto | $500 |
| 40 | Marilyn Mangle | $500 |
| 40 | Lawrence B. Jordan Jr. | $500 |
| 40 | Ayse Caglayan Ustundag | $500 |
| 40 | Scott Holdman | $500 |
| 40 | Christina Holmes | $500 |
| 40 | Art Smith | $500 |
| 40 | Chris Fiddes | $500 |
| 40 | Sean Gillen | $500 |
| 40 | Sarah Flanagan | $500 |
| 40 | Brian Sartain | $500 |
| 40 | Christopher Toppin | $500 |
| 40 | Sal Marino | $500 |
| 40 | Christopher Jessup | $500 |
| 40 | Edward P. Ayoob | $500 |
| 40 | Nicole Colen | $500 |
| 40 | Robin Portman | $500 |
| 40 | Tony Coelho | $500 |
| 40 | John Smith | $500 |
| 40 | Louise Lamphier | $500 |
| 40 | Sateesh Nabar | $500 |
| 40 | Afsin Ustundag | $500 |
| 40 | Craig Grotzky | $500 |
| 40 | Margaret Meister | $500 |
| 40 | Rush Taggart | $500 |
| 94 | Andrew Jergens | $475 |
| 95 | Elizabeth B. Weinstock | $400 |
| 95 | Clyde Williams | $400 |
| 95 | Earl Singer | $400 |
| 95 | Ann Frank | $400 |
| 99 | Samuel L. Vance | $350 |
| 99 | John Hirschi | $350 |
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