| David Scott | American Council of Engineering Companies | Undecided | GA89 |
| Joseph Buffington | County Planning and Zoning Officials of Iowa | Undecided | GA89 |
| Emma Schmit | Food & Water Watch | Supporting | GA89 |
| John Aspray | Food & Water Watch | Supporting | GA89 |
| Mackenzie Aime | Food & Water Watch | Supporting | GA89 |
| Teresa Bomhoff | IA Mental Health Planning Council | Supporting | GA89 |
| Jessica Mazour | Iowa Chapter of Sierra Club | Supporting | GA89 |
| Pam Mackey-Taylor | Iowa Chapter of Sierra Club | Supporting | GA89 |
| Adam Mason | Iowa Citizens for Community Improvement Action Fund | Supporting | GA89 |
| Ava Auen-Ryan | Iowa Citizens for Community Improvement Action Fund | Supporting | GA89 |
| David Scott | Iowa Engineering Society | Undecided | GA89 |
| Angela Davis | Iowa Environmental Council | Supporting | GA89 |
| Hannah McDowell | Iowa Farmers Union | Supporting | GA89 |
| Hannah McDowell | Iowa Farmers Union | Undecided | GA89 |
| Nick Laning | Iowa Farmers Union | Supporting | GA89 |
| Nick Laning | Iowa Farmers Union | Undecided | GA89 |
| Threase Harms | Iowa Farmers Union | Supporting | GA89 |
| Threase Harms | Iowa Farmers Union | Undecided | GA89 |
| Jamie Cashman | Iowa State Association of Counties | Undecided | GA89 |
| Kristi Harshbarger | Iowa State Association of Counties | Undecided | GA89 |
| Lucas Beenken | Iowa State Association of Counties | Undecided | GA89 |
| William Peterson | Iowa State Association of Counties | Undecided | GA89 |
| Jamie Cashman | Iowa State Association of County Supervisors | Undecided | GA89 |
| Kristi Harshbarger | Iowa State Association of County Supervisors | Undecided | GA89 |
| Lucas Beenken | Iowa State Association of County Supervisors | Undecided | GA89 |
| William Peterson | Iowa State Association of County Supervisors | Undecided | GA89 |
| David Scott | Iowa Water Well Association | Undecided | GA89 |
| Tim Wagner | Izaak Walton League of America | Supporting | GA89 |
| Steven Schoenebaum | Smithfield Foods, Inc. | Undecided | GA89 |