| Jeff Smith | Agribusiness Association of Iowa | Undecided | GA90 |
| Maggie Smith-Fitzgerald | Agribusiness Association of Iowa | Undecided | GA90 |
| Matt Fitzgerald | Agribusiness Association of Iowa | Undecided | GA90 |
| Christopher Rants | Center for Rural Affairs | Supporting | GA90 |
| John Cacciatore | Center for Rural Affairs | Supporting | GA90 |
| Johnathan Hladik | Center for Rural Affairs | Supporting | GA90 |
| Jefferson Fink | Conservation Districts of Iowa | Supporting | GA90 |
| Jim Obradovich | Conservation Districts of Iowa | Supporting | GA90 |
| John Hirl | Ducks Unlimited, Inc. | Supporting | GA90 |
| Marc Beltrame | Ducks Unlimited, Inc. | Supporting | GA90 |
| Joseph Hrdlicka | Genentech, Inc., A Member of the Roche Group | Withdrawn | GA90 |
| Joseph Hrdlicka | Genentech, Inc., A Member of the Roche Group | Supporting | GA90 |
| Tom Chapman | Iowa Catholic Conference | Supporting | GA90 |
| Kellie Paschke | Iowa Cattlemen's Association | Undecided | GA90 |
| Kelly Meyers | Iowa Cattlemen's Association | Undecided | GA90 |
| Troy Skinner | Iowa Cattlemen's Association | Undecided | GA90 |
| Pam Mackey-Taylor | Iowa Chapter of Sierra Club | Supporting | GA90 |
| Jeff Smith | Iowa Corn Growers Association | Undecided | GA90 |
| Maggie Smith-Fitzgerald | Iowa Corn Growers Association | Undecided | GA90 |
| Matt Fitzgerald | Iowa Corn Growers Association | Undecided | GA90 |
| Mindy Poldberg | Iowa Corn Growers Association | Undecided | GA90 |
| Haley Hook | Iowa Department of Agriculture & Land Stewardship | Undecided | GA90 |
| Todd Coffelt | Iowa Dept. of Natural Resources | Undecided | GA90 |
| John Torbert | Iowa Drainage District Association | Undecided | GA90 |
| Mona Bond | Iowa Drainage District Association | Undecided | GA90 |
| Kevin Kuhle | Iowa Farm Bureau Federation | Undecided | GA90 |
| Matt Gronewald | Iowa Farm Bureau Federation | Undecided | GA90 |
| Matthew Steinfeldt | Iowa Farm Bureau Federation | Undecided | GA90 |
| Chelsea Hoye | Iowa Farmers Union | Supporting | GA90 |
| Threase Harms | Iowa Farmers Union | Supporting | GA90 |
| Doug Struyk | Iowa Soybean Association | Undecided | GA90 |
| Jennifer Dorman | Iowa Soybean Association | Undecided | GA90 |
| Jim Carney | Iowa Soybean Association | Undecided | GA90 |
| Amy Campbell | League of Women Voters of Iowa | Undecided | GA90 |
| Craig Patterson | League of Women Voters of Iowa | Undecided | GA90 |
| Kellie Paschke | Marion County Board of Supervisors | Undecided | GA90 |
| Kelly Meyers | Marion County Board of Supervisors | Undecided | GA90 |
| Troy Skinner | Marion County Board of Supervisors | Undecided | GA90 |