| MIke Delaney | Citizens For A Healthy Iowa | Opposing | GA88 |
| Jim Obradovich | Coalition for Iowa Woodlands and Trees | Opposing | GA88 |
| Tim Reilly | Department of Revenue | Undecided | GA88 |
| Eric Goranson | Iowa Bowhunters Association | Opposing | GA88 |
| Pam Mackey-Taylor | Iowa Chapter of Sierra Club | Opposing | GA88 |
| Mike Heller | Iowa Conservation Alliance | Opposing | GA88 |
| Mike Heller | Iowa Conservation Alliance | Undecided | GA88 |
| Paula Feltner | Iowa Conservation Alliance | Opposing | GA88 |
| Paula Feltner | Iowa Conservation Alliance | Undecided | GA88 |
| Tammie Krausman | Iowa Dept. of Natural Resources | Undecided | GA88 |
| Dane Schumann | Iowa Environmental Council | Opposing | GA88 |
| Maddie Wilcox | Iowa Environmental Council | Opposing | GA88 |
| Threase Harms | Iowa Environmental Council | Opposing | GA88 |
| Don Petersen | Iowa Farm Bureau Federation | Supporting | GA88 |
| Kevin Kuhle | Iowa Farm Bureau Federation | Supporting | GA88 |
| Matthew Steinfeldt | Iowa Farm Bureau Federation | Supporting | GA88 |
| Dane Schumann | Iowa Farmers Union | Undecided | GA88 |
| Maddie Wilcox | Iowa Farmers Union | Undecided | GA88 |
| Threase Harms | Iowa Farmers Union | Undecided | GA88 |
| Amy Campbell | Iowa Natural Heritage Foundation | Undecided | GA88 |
| Anna Gray | Iowa Natural Heritage Foundation | Undecided | GA88 |
| Craig Patterson | Iowa Natural Heritage Foundation | Undecided | GA88 |
| Brad Epperly | Iowa Society of Certified Public Accountants | Undecided | GA88 |
| Dustin Miller | Iowa Society of Certified Public Accountants | Undecided | GA88 |
| Katie Graham | Iowa Society of Certified Public Accountants | Undecided | GA88 |
| Paula Dierenfeld | Iowa Society of Certified Public Accountants | Undecided | GA88 |
| Jill Altringer | Iowa Soybean Association | Undecided | GA88 |
| Mike Heller | Iowa State Association of Assessors | Undecided | GA88 |
| Paula Feltner | Iowa State Association of Assessors | Undecided | GA88 |
| Jamie Cashman | Iowa State Association of Counties | Undecided | GA88 |
| Kristi Harshbarger | Iowa State Association of Counties | Undecided | GA88 |
| Lucas Beenken | Iowa State Association of Counties | Undecided | GA88 |
| William Peterson | Iowa State Association of Counties | Undecided | GA88 |
| Jamie Cashman | Iowa State Association of County Supervisors | Supporting | GA88 |
| Kristi Harshbarger | Iowa State Association of County Supervisors | Supporting | GA88 |
| Lucas Beenken | Iowa State Association of County Supervisors | Supporting | GA88 |
| William Peterson | Iowa State Association of County Supervisors | Supporting | GA88 |
| Ernie Adkison | Iowans for Tax Relief | Undecided | GA88 |
| Victoria Sinclair | Iowans for Tax Relief | Undecided | GA88 |
| MIke Delaney | Izaak Walton League - Iowa Division | Opposing | GA88 |
| Gary Grant | Linn County Board of Supervisors | Opposing | GA88 |
| Larry Murphy | Linn County Board of Supervisors | Opposing | GA88 |
| Meghan Malloy | Linn County Board of Supervisors | Opposing | GA88 |
| Mona Bond | Manatts Inc. | Opposing | GA88 |
| Gary Grant | Midwestern Trading, Inc. | Opposing | GA88 |
| Larry Murphy | Midwestern Trading, Inc. | Opposing | GA88 |
| Meghan Malloy | Midwestern Trading, Inc. | Opposing | GA88 |
| MIke Delaney | Raccoon River Watershed Association | Opposing | GA88 |
| Amber Markham | The Nature Conservancy | Undecided | GA88 |
| Doug Struyk | The Nature Conservancy | Undecided | GA88 |
| Jennifer Dorman | The Nature Conservancy | Undecided | GA88 |
| Jim Carney | The Nature Conservancy | Undecided | GA88 |
| Eric Goranson | Unilever United States | Undecided | GA88 |
| Karla Fultz McHenry | Unilever United States | Undecided | GA88 |
| Michael Triplett | Unilever United States | Undecided | GA88 |
| Stefani Grant | Unilever United States | Undecided | GA88 |
| Gary Grant | Urban County Coalition | Opposing | GA88 |
| Larry Murphy | Urban County Coalition | Opposing | GA88 |
| Meghan Malloy | Urban County Coalition | Opposing | GA88 |