| Troy Price | AFSCME Iowa Council 61 | Opposing | GA88 |
| Julie Vande Hoef | Alliant Energy Corporation | Undecided | GA88 |
| David Adelman | American Chemistry Council | Opposing | GA88 |
| Frank Chiodo | American Chemistry Council | Opposing | GA88 |
| Matt Hinch | American Chemistry Council | Opposing | GA88 |
| Sara Allen | American Chemistry Council | Opposing | GA88 |
| Katie Hall | American Property Casualty Insurance Association (APCIA) | Undecided | GA88 |
| Mike St. Clair | American Property Casualty Insurance Association (APCIA) | Undecided | GA88 |
| Drew Klein | Americans For Prosperity | Undecided | GA88 |
| Tyler Raygor | Americans For Prosperity | Undecided | GA88 |
| Sandra Conlin | Associated Builders & Contractors of Iowa | Supporting | GA88 |
| Doug Struyk | City of Iowa City | Opposing | GA88 |
| Jennifer Dorman | City of Iowa City | Opposing | GA88 |
| Jim Carney | City of Iowa City | Opposing | GA88 |
| Josh Mandelbaum | Environmental Law and Policy Center | Opposing | GA88 |
| Steve Falck | Environmental Law and Policy Center | Opposing | GA88 |
| Jay Iverson | Home Builders Association of Iowa | Supporting | GA88 |
| Michael McCarthy | Iowa Alliance For Retired Americans | Opposing | GA88 |
| Kevin Condon | Iowa Association of Electric Cooperatives | Undecided | GA88 |
| Brad Epperly | Iowa Association of Municipal Utilities | Undecided | GA88 |
| Dustin Miller | Iowa Association of Municipal Utilities | Undecided | GA88 |
| Katie Graham | Iowa Association of Municipal Utilities | Undecided | GA88 |
| Paula Dierenfeld | Iowa Association of Municipal Utilities | Undecided | GA88 |
| Timothy Whipple | Iowa Association of Municipal Utilities | Undecided | GA88 |
| Jennifer Kingland | Iowa Association of Realtors | Supporting | GA88 |
| Pam Mackey-Taylor | Iowa Chapter of Sierra Club | Opposing | GA88 |
| Brad Epperly | Iowa Chapter, American Institute of Architects | Undecided | GA88 |
| Dustin Miller | Iowa Chapter, American Institute of Architects | Undecided | GA88 |
| Katie Graham | Iowa Chapter, American Institute of Architects | Undecided | GA88 |
| Paula Dierenfeld | Iowa Chapter, American Institute of Architects | Undecided | GA88 |
| Brian Carter | Iowa Conference of United Methodist Church | Opposing | GA88 |
| Carolyn Uhlenhake-Walker | 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 |
| Roberta Paige | Iowa Conference of United Methodist Church | Opposing | GA88 |
| Amy McCoy | Iowa Dept. of Public Health | Undecided | GA88 |
| Jennifer Terry | Iowa Environmental Council | Opposing | GA88 |
| Jordan Oster | Iowa Environmental Council | Opposing | GA88 |
| Kerri Johannsen | Iowa Environmental Council | Opposing | GA88 |
| Michael Schmidt | Iowa Environmental Council | Opposing | GA88 |
| Angela Davis | Iowa Lumber Association | Supporting | GA88 |
| Michael Gronstal | Iowa State Building and Construction Trades | Undecided | GA88 |
| Brian Johnson | Mechanical Contractors Association of Iowa (MCAI) | Undecided | GA88 |
| Onnalee Gettler | MidAmerican Energy Company | Undecided | GA88 |
| Brian Johnson | NECA - Iowa (NEC) | Undecided | GA88 |
| Amy Campbell | Professional Developers of Iowa (PDI) | Undecided | GA88 |
| Craig Patterson | Professional Developers of Iowa (PDI) | Undecided | GA88 |