| Brad Epperly | Ames Chamber of Commerce | Undecided | GA89 |
| Dustin Miller | Ames Chamber of Commerce | Undecided | GA89 |
| Jim Obradovich | Boone and Scenic Valley Railroad | Undecided | GA89 |
| Robert Mulqueen | Boone and Scenic Valley Railroad | Undecided | GA89 |
| Jim Obradovich | Burlington Junction Railway | Undecided | GA89 |
| Robert Mulqueen | Burlington Junction Railway | Undecided | GA89 |
| Kate Walton | CN Rail | Undecided | GA89 |
| Matt Eide | CN Rail | Undecided | GA89 |
| Drew Kamp | Council Bluffs Chamber of Commerce | Undecided | GA89 |
| Andrea Woodard | Greater Des Moines Partnership | Undecided | GA89 |
| Brad Epperly | Greater Des Moines Partnership | Undecided | GA89 |
| Dustin Miller | Greater Des Moines Partnership | Undecided | GA89 |
| Brad Lint | Iowa Association for Justice | Opposing | GA89 |
| Lisa Davis-Cook | Iowa Association for Justice | Opposing | GA89 |
| Nick Laning | Iowa Bicycle Coalition | Undecided | GA89 |
| Rachel Ong | Iowa Bicycle Coalition | Undecided | GA89 |
| Threase Harms | Iowa Bicycle Coalition | Undecided | GA89 |
| Kellie Paschke | Iowa Cattlemen's Association | Undecided | GA89 |
| Kelly Meyers | Iowa Cattlemen's Association | Undecided | GA89 |
| Logan Murray | Iowa Cattlemen's Association | Undecided | GA89 |
| Troy Skinner | Iowa Cattlemen's Association | Undecided | GA89 |
| Brad Epperly | Iowa Chamber Alliance | Undecided | GA89 |
| Dustin Miller | Iowa Chamber Alliance | Undecided | GA89 |
| Pam Mackey-Taylor | Iowa Chapter of Sierra Club | Undecided | GA89 |
| Brad Epperly | Iowa Defense Counsel Association | Undecided | GA89 |
| Dustin Miller | Iowa Defense Counsel Association | Undecided | GA89 |
| Jim Obradovich | Iowa Interstate Railroad | Undecided | GA89 |
| Robert Weiser | Iowa Northern Railway Company | Supporting | GA89 |
| Doug Struyk | Iowa State Bar Association | Undecided | GA89 |
| Jennifer Dorman | Iowa State Bar Association | Undecided | GA89 |
| Jim Carney | Iowa State Bar Association | Undecided | GA89 |
| Larry Murphy | Personal Interest-Larry Murphy | Supporting | GA89 |
| Jim Obradovich | Progressive Rail Iowa (Iowa Traction RR and Iowa Southern RR) | Undecided | GA89 |
| Robert Mulqueen | Progressive Rail Iowa (Iowa Traction RR and Iowa Southern RR) | Undecided | GA89 |