| David Scott | American Council of Engineering Companies | Undecided | GA88 |
| Drew Kamp | Ames Chamber of Commerce | Undecided | GA88 |
| Robert Weiser | Annett Holdings | Undecided | GA88 |
| Robert Weiser | CRST International | Undecided | GA88 |
| Tim Reilly | Department of Revenue | Undecided | GA88 |
| Josh Mandelbaum | Environmental Law and Policy Center | Supporting | GA88 |
| Steve Falck | Environmental Law and Policy Center | Supporting | 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 |
| Joe Murphy | Greater Des Moines Partnership | Undecided | GA88 |
| Katie Graham | Greater Des Moines Partnership | Undecided | GA88 |
| Paula Dierenfeld | Greater Des Moines Partnership | Undecided | GA88 |
| James Piazza, Jr. | Heavy Highway Contractors Association | Undecided | GA88 |
| Brad Hartkopf | 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 |
| 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 |
| John Stineman | 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 | Supporting | GA88 |
| Jennifer Terry | Iowa Environmental Council | Supporting | GA88 |
| Jordan Oster | Iowa Environmental Council | Supporting | GA88 |
| Kerri Johannsen | Iowa Environmental Council | Supporting | GA88 |
| David Scott | Iowa Good Roads Association | Undecided | GA88 |
| David Scott | Iowa Motor Truck Association | 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 |