| Michael Triplett | Alliance For Automotive Innovation | Undecided | GA88 |
| David Scott | American Council of Engineering Companies | Withdrawn | GA88 |
| David Scott | American Council of Engineering Companies | Supporting | GA88 |
| Drew Kamp | Ames Chamber of Commerce | Undecided | GA88 |
| Courtney Craig | Annett Holdings | Undecided | GA88 |
| Robert Weiser | Annett Holdings | Undecided | GA88 |
| Scott Newhard | Associated General Contractors of Iowa | Undecided | GA88 |
| Courtney Craig | CRST International | Undecided | GA88 |
| Robert Weiser | CRST International | Undecided | GA88 |
| Josh Mandelbaum | Environmental Law and Policy Center | Undecided | GA88 |
| Steve Falck | Environmental Law and Policy Center | Undecided | GA88 |
| Andrea Woodard | Greater Des Moines Partnership | Undecided | GA88 |
| Brad Epperly | Greater Des Moines Partnership | Undecided | GA88 |
| Dustin Miller | Greater Des Moines Partnership | Undecided | GA88 |
| Katie Graham | Greater Des Moines Partnership | Undecided | GA88 |
| Paula Dierenfeld | Greater Des Moines Partnership | Undecided | GA88 |
| Brad Epperly | Iowa Automobile Dealers Association | Undecided | GA88 |
| Dustin Miller | Iowa Automobile Dealers Association | Undecided | GA88 |
| Katie Graham | Iowa Automobile Dealers Association | Undecided | GA88 |
| Paula Dierenfeld | Iowa Automobile Dealers Association | Undecided | GA88 |
| Brad Epperly | Iowa Chamber Alliance | Undecided | GA88 |
| Dustin Miller | Iowa Chamber Alliance | Undecided | GA88 |
| Katie Graham | Iowa Chamber Alliance | Undecided | GA88 |
| Paula Dierenfeld | Iowa Chamber Alliance | Undecided | GA88 |
| Pam Mackey-Taylor | Iowa Chapter of Sierra Club | Undecided | GA88 |
| Susan Fenton | Iowa Dept. of Transportation | Undecided | GA88 |
| David Scott | Iowa Good Roads Association | Withdrawn | GA88 |
| David Scott | Iowa Good Roads Association | Supporting | GA88 |
| David Scott | Iowa Motor Truck Association | Undecided | GA88 |
| David Scott | Iowa Motor Truck Association | Withdrawn | GA88 |
| David Scott | Iowa Motor Truck Association | Supporting | 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 |
| 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 | Undecided | GA88 |
| Kristi Harshbarger | Iowa State Association of County Supervisors | Undecided | GA88 |
| Lucas Beenken | Iowa State Association of County Supervisors | Undecided | GA88 |
| William Peterson | Iowa State Association of County Supervisors | Undecided | GA88 |
| Victoria Sinclair | Iowans for Tax Relief | Opposing | GA88 |
| Bob Rafferty | Truckstops of Iowa | Undecided | GA88 |
| Rachel Ong | Truckstops of Iowa | Undecided | GA88 |