| Brad Epperly | Ames Chamber of Commerce | Undecided | GA89 |
| Dustin Miller | Ames Chamber of Commerce | Undecided | GA89 |
| Drew Kamp | Council Bluffs Chamber of Commerce | Undecided | GA89 |
| Josh Mandelbaum | Environmental Law and Policy Center | Supporting | GA89 |
| Steve Falck | Environmental Law and Policy Center | Supporting | GA89 |
| Andrea Woodard | Greater Des Moines Partnership | Undecided | GA89 |
| Brad Epperly | Greater Des Moines Partnership | Undecided | GA89 |
| Dustin Miller | Greater Des Moines Partnership | Undecided | GA89 |
| Amy Campbell | Iowa Association of County Conservation Boards | Supporting | GA89 |
| Craig Patterson | Iowa Association of County Conservation Boards | Supporting | GA89 |
| Alex Cutchey | Iowa Association of Municipal Utilities | Undecided | GA89 |
| Brad Epperly | Iowa Association of Municipal Utilities | Undecided | GA89 |
| Dustin Miller | Iowa Association of Municipal Utilities | Undecided | GA89 |
| Nick Laning | Iowa Bicycle Coalition | Supporting | GA89 |
| Nick Laning | Iowa Bicycle Coalition | Undecided | GA89 |
| Rachel Ong | Iowa Bicycle Coalition | Supporting | GA89 |
| Rachel Ong | Iowa Bicycle Coalition | Undecided | GA89 |
| Threase Harms | Iowa Bicycle Coalition | Supporting | GA89 |
| Threase Harms | Iowa Bicycle Coalition | Undecided | GA89 |
| Brad Epperly | Iowa Chamber Alliance | Undecided | GA89 |
| Dustin Miller | Iowa Chamber Alliance | Undecided | GA89 |
| Pam Mackey-Taylor | Iowa Chapter of Sierra Club | Supporting | GA89 |
| Brian Carter | Iowa Conference of United Methodist Church | Supporting | GA89 |
| Gary Nims | Iowa Conference of United Methodist Church | Supporting | GA89 |
| Rita Carter | Iowa Conference of United Methodist Church | Supporting | GA89 |
| Roberta Paige | Iowa Conference of United Methodist Church | Supporting | 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 |
| Amy Campbell | Iowa Natural Heritage Foundation | Supporting | GA89 |
| Anna Gray | Iowa Natural Heritage Foundation | Supporting | GA89 |
| Craig Patterson | Iowa Natural Heritage Foundation | Supporting | GA89 |
| Nick Laning | Iowa Rivers Revival | Supporting | GA89 |
| Nick Laning | Iowa Rivers Revival | Undecided | GA89 |
| Threase Harms | Iowa Rivers Revival | Supporting | GA89 |
| Threase Harms | Iowa Rivers Revival | Undecided | GA89 |
| David Adelman | Iowa Water Land Legacy Coalition | Supporting | GA89 |
| Frank Chiodo | Iowa Water Land Legacy Coalition | Supporting | GA89 |
| Matt Hinch | Iowa Water Land Legacy Coalition | Supporting | GA89 |
| Sara Allen | Iowa Water Land Legacy Coalition | Supporting | GA89 |
| Amy Campbell | League of Women Voters of Iowa | Supporting | GA89 |
| Craig Patterson | League of Women Voters of Iowa | Supporting | GA89 |