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 John R. Thune's campaign in March.
| Rank | Contributor | Amount |
|---|---|---|
| 1 | William C. Steere Jr. | $5,800 |
| 1 | Thomas Everist | $5,800 |
| 1 | Matthew Hocks | $5,800 |
| 1 | Bill D. Marlette | $5,800 |
| 1 | Barbara Everist | $5,800 |
| 6 | Lawrence G. Willcox | $4,300 |
| 7 | Susan D. Jarvis | $3,000 |
| 8 | William Gassen III | $2,900 |
| 8 | Todd A. Swenson | $2,900 |
| 8 | Robert K. Casper | $2,900 |
| 8 | Randy E. Bury | $2,900 |
| 8 | Micah P. Aberson | $2,900 |
| 8 | Kent Walker | $2,900 |
| 8 | Karen A. Brown | $2,900 |
| 8 | Jose Fanjul Jr. | $2,900 |
| 8 | Jill Gassen | $2,900 |
| 8 | Jaclyn R.S. Aberson | $2,900 |
| 8 | Corey W. Brown | $2,900 |
| 8 | Brad Smith | $2,900 |
| 8 | Arlene F. Casper | $2,900 |
| 21 | Rob Lehman | $2,800 |
| 22 | Darren Walker | $2,500 |
| 22 | Dan Kippley | $2,500 |
| 24 | John J. O'Neill | $2,300 |
| 25 | Teresa L. Cauwels | $2,000 |
| 25 | Robert Long | $2,000 |
| 25 | Robert J. Lowe | $2,000 |
| 25 | Robert E. Coker | $2,000 |
| 25 | Paul Hanson | $2,000 |
| 25 | Nathan Peterson | $2,000 |
| 25 | Malcolm S. Wade Jr. | $2,000 |
| 25 | John M. Snyder | $2,000 |
| 25 | Jennifer G. Grennan | $2,000 |
| 25 | Casey Mcloed | $2,000 |
| 25 | Barry Zwahlen | $2,000 |
| 25 | Angela Uttecht | $2,000 |
| 25 | Alexander L. Fanjul | $2,000 |
| 38 | Larry F. Ness | $1,600 |
| 39 | Tom A. Rau | $1,500 |
| 39 | Phil Mount | $1,500 |
| 39 | David Kneip | $1,500 |
| 39 | Brett Brown | $1,500 |
| 43 | Jill Irene Swenson | $1,100 |
| 43 | Bruce E. Toll | $1,100 |
| 45 | Vickie Gartley | $1,000 |
| 45 | Vicki Cox Golder | $1,000 |
| 45 | Velda Lueders | $1,000 |
| 45 | Thomas Murphy | $1,000 |
| 45 | Tara N. Smith | $1,000 |
| 45 | Stuart Kent Lehr | $1,000 |
| 45 | Steven Young | $1,000 |
| 45 | Scott M. Schaefer | $1,000 |
| 45 | Sarah Sorrell | $1,000 |
| 45 | Roxana Lupu | $1,000 |
| 45 | Randall M. Russell | $1,000 |
| 45 | Philip Becker | $1,000 |
| 45 | Patrick J. Raffaniello | $1,000 |
| 45 | Nicholas W. Olson | $1,000 |
| 45 | Michael K. Torrey | $1,000 |
| 45 | Michael C. Wilde | $1,000 |
| 45 | Matthew Johnson | $1,000 |
| 45 | Matthew J. Sorrell | $1,000 |
| 45 | Marilyn M. Elliott | $1,000 |
| 45 | Luis Garcia | $1,000 |
| 45 | Landon Stropko | $1,000 |
| 45 | Kyle Lalim | $1,000 |
| 45 | Kitty Wallace | $1,000 |
| 45 | Kate C. Hull | $1,000 |
| 45 | John Blom | $1,000 |
| 45 | Jana Powell | $1,000 |
| 45 | Geoffrey F. Haft | $1,000 |
| 45 | Gaston Cantens | $1,000 |
| 45 | Francois Gregoire | $1,000 |
| 45 | Erica C. Deboer | $1,000 |
| 45 | Douglas J. Stengel | $1,000 |
| 45 | Douglas Ian Mcdonald | $1,000 |
| 45 | Donald D. Valentine | $1,000 |
| 45 | Donald D. Jacobs | $1,000 |
| 45 | Don Faught | $1,000 |
| 45 | Daryl Braham | $1,000 |
| 45 | Daniel Scott Aberson | $1,000 |
| 45 | Craig Stevens | $1,000 |
| 45 | Christopher L. Javens | $1,000 |
| 45 | Charles Oppler | $1,000 |
| 45 | Carolyn Coda | $1,000 |
| 45 | Bruce R. Lauritzen | $1,000 |
| 45 | Brian D. Ballard | $1,000 |
| 45 | Brandon Martens | $1,000 |
| 45 | Bobbie Tibbetts | $1,000 |
| 90 | Robbi Toll | $900 |
| 90 | Edward D. Hamilton | $900 |
| 92 | George Robb Rogers | $800 |
| 93 | Andy Munce | $750 |
| 94 | Harold C. Taber Jr. | $600 |
| 95 | Larry James Nelson | $550 |
| 96 | William Jiles | $500 |
| 96 | William James Johnston | $500 |
| 96 | William Aceto | $500 |
| 96 | Ulrike Johnson | $500 |
| 96 | Travis Close | $500 |
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