| Mazie Stilwell | AFSCME Iowa Council 61 | Opposing | GA88 |
| Morgan Miller | AFSCME Iowa Council 61 | Opposing | GA88 |
| Drew Klein | Americans For Prosperity | Supporting | GA88 |
| Tyler Raygor | Americans For Prosperity | Supporting | GA88 |
| Drew Kamp | Ames Chamber of Commerce | Supporting | GA88 |
| Tim Reilly | Department of Revenue | Undecided | GA88 |
| Andrea Woodard | Greater Des Moines Partnership | Supporting | GA88 |
| Brad Epperly | Greater Des Moines Partnership | Supporting | GA88 |
| Dustin Miller | Greater Des Moines Partnership | Supporting | GA88 |
| Joe Murphy | Greater Des Moines Partnership | Supporting | GA88 |
| Katie Graham | Greater Des Moines Partnership | Supporting | GA88 |
| Paula Dierenfeld | Greater Des Moines Partnership | Supporting | GA88 |
| Teresa Bomhoff | IA Mental Health Planning Council | Opposing | GA88 |
| Brad Hartkopf | Iowa Association of Business and Industry (ABI) | Undecided | GA88 |
| Drew Wynes | Iowa Association of Business and Industry (ABI) | Undecided | GA88 |
| John Davis | Iowa Association of Business and Industry (ABI) | Undecided | GA88 |
| Michael Ralston | Iowa Association of Business and Industry (ABI) | Undecided | GA88 |
| Nicole Crain | Iowa Association of Business and Industry (ABI) | Undecided | GA88 |
| Jenica Lensmeyer | Iowa Bankers Association | Undecided | GA88 |
| Mike Rozenboom | Iowa Bankers Association | Undecided | GA88 |
| Robert Hartwig | Iowa Bankers Association | Undecided | GA88 |
| Sharon Presnall | Iowa Bankers Association | Undecided | GA88 |
| Larry Murphy | Iowa Catholic Conference | Undecided | GA88 |
| Meghan Malloy | Iowa Catholic Conference | Undecided | GA88 |
| Kellie Paschke | Iowa Cattlemen's Association | Undecided | GA88 |
| Troy Skinner | Iowa Cattlemen's Association | Undecided | GA88 |
| Brad Epperly | Iowa Chamber Alliance | Supporting | GA88 |
| Dustin Miller | Iowa Chamber Alliance | Supporting | GA88 |
| Katie Graham | Iowa Chamber Alliance | Supporting | GA88 |
| Paula Dierenfeld | Iowa Chamber Alliance | Supporting | GA88 |
| Brian Carter | Iowa Conference of United Methodist Church | Opposing | GA88 |
| Gary Nims | Iowa Conference of United Methodist Church | Opposing | GA88 |
| Rita Carter | Iowa Conference of United Methodist Church | Opposing | GA88 |
| Sheila Corsbie | Iowa Conference of United Methodist Church | Opposing | GA88 |
| Jeff Smith | Iowa Corn Growers Association | Supporting | GA88 |
| Jerry Fitzgerald | Iowa Corn Growers Association | Supporting | GA88 |
| Maggie Smith-Fitzgerald | Iowa Corn Growers Association | Supporting | GA88 |
| Matt Fitzgerald | Iowa Corn Growers Association | Supporting | GA88 |
| Mindy Poldberg | Iowa Corn Growers Association | Supporting | 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 |
| Charlie Wishman | Iowa Federation of Labor, AFL-CIO | Opposing | 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 |
| Doug Struyk | Iowa State Bar Association | Undecided | GA88 |
| Jennifer Dorman | Iowa State Bar Association | Undecided | GA88 |
| Jim Carney | Iowa State Bar Association | Undecided | GA88 |
| Bradley Hudson | Iowa State Education Association | Opposing | GA88 |
| Melissa Peterson | Iowa State Education Association | Opposing | GA88 |
| Jennifer Kingland | Iowa Taxpayers Association | Undecided | GA88 |
| Tom Sands | Iowa Taxpayers Association | Undecided | GA88 |
| Jenica Lensmeyer | Iowa Trust Association | Undecided | GA88 |
| Mike Rozenboom | Iowa Trust Association | Undecided | GA88 |
| Robert Hartwig | Iowa Trust Association | Undecided | GA88 |
| Sharon Presnall | Iowa Trust Association | Undecided | GA88 |
| Ernie Adkison | Iowans for Tax Relief | Supporting | GA88 |
| Victoria Sinclair | Iowans for Tax Relief | Supporting | GA88 |
| Cody Carlson | National Federation of Independent Business (NFIB /IA) | Supporting | GA88 |
| Tammy Kobza | Phyllis Schlafly Eagles of Iowa | Supporting | GA88 |
| Amy Campbell | Professional Developers of Iowa (PDI) | Undecided | GA88 |
| Craig Patterson | Professional Developers of Iowa (PDI) | Undecided | GA88 |
| Margaret Buckton | Rural School Advocates of Iowa | Opposing | GA88 |
| Jim Romar | Teamsters Local 238 | Opposing | GA88 |
| Sydney Gangestad | The Iowa Academy of Trust and Estate Counsel | Supporting | GA88 |
| Tim Coonan | The Iowa Academy of Trust and Estate Counsel | Supporting | GA88 |
| Margaret Buckton | Urban Education Network of Iowa | Opposing | GA88 |