| Morgan Miller | AFSCME Iowa Council 61 | Opposing | 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) | Opposing | GA88 |
| Mike St. Clair | American Property Casualty Insurance Association (APCIA) | Opposing | GA88 |
| Drew Klein | Americans For Prosperity | Undecided | GA88 |
| Tyler Raygor | Americans For Prosperity | Undecided | GA88 |
| Sandra Conlin | Associated Builders & Contractors of Iowa | Opposing | GA88 |
| Josh Mandelbaum | Environmental Law and Policy Center | Opposing | GA88 |
| Steve Falck | Environmental Law and Policy Center | Opposing | GA88 |
| Jim Obradovich | Greater Des Moines Heating & Cooling Association | Undecided | GA88 |
| Mike St. Clair | Hartford Steam Boiler Inspection and Insurance Company | Opposing | GA88 |
| Jay Iverson | Home Builders Association of Iowa | Undecided | GA88 |
| Maddie Wilcox | IBEW Iowa State Conference | Opposing | GA88 |
| Maddie Wilcox | IBEW Iowa State Conference | Undecided | GA88 |
| Threase Harms | IBEW Iowa State Conference | Opposing | GA88 |
| Threase Harms | IBEW Iowa State Conference | Undecided | GA88 |
| Michael McCarthy | Iowa Alliance For Retired Americans | Opposing | GA88 |
| Jim Obradovich | Iowa Association of Building Officials | Undecided | GA88 |
| Pete McRoberts | Iowa Association of Building Officials | Undecided | GA88 |
| Robert Mulqueen | Iowa Association of Building Officials | Undecided | GA88 |
| Kevin Condon | Iowa Association of Electric Cooperatives | Undecided | GA88 |
| Jennifer Kingland | Iowa Association of Realtors | Undecided | GA88 |
| James Kersten | Iowa Central Community College | Undecided | 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 |
| Chandlor Collins | Iowa Dept. of Public Safety | Undecided | GA88 |
| Jennifer Terry | Iowa Environmental Council | Opposing | GA88 |
| Jennifer Terry | Iowa Environmental Council | Undecided | GA88 |
| Jordan Oster | Iowa Environmental Council | Opposing | GA88 |
| Jordan Oster | Iowa Environmental Council | Undecided | GA88 |
| Kerri Johannsen | Iowa Environmental Council | Opposing | GA88 |
| Kerri Johannsen | Iowa Environmental Council | Undecided | GA88 |
| Michael Schmidt | Iowa Environmental Council | Opposing | GA88 |
| Michael Schmidt | Iowa Environmental Council | Undecided | GA88 |
| Charlie Wishman | Iowa Federation of Labor, AFL-CIO | Opposing | GA88 |
| Frederick Haskins | Iowa Insurance Associates | Opposing | GA88 |
| Michael Gronstal | Iowa State Building and Construction Trades | Opposing | GA88 |
| Brian Johnson | Mechanical Contractors Association of Iowa (MCAI) | Opposing | GA88 |
| Christopher Rants | Mechanical Contractors Association of Iowa (MCAI) | Opposing | GA88 |
| Justin Hupfer | Mechanical Contractors Association of Iowa (MCAI) | Opposing | GA88 |
| Brian Johnson | NECA - Iowa (NEC) | Opposing | GA88 |
| Christopher Rants | NECA - Iowa (NEC) | Opposing | GA88 |
| Justin Hupfer | NECA - Iowa (NEC) | Opposing | GA88 |
| Christopher Rants | Plumbers and Steam Fitters Local 33 | Opposing | GA88 |
| John Cacciatore | Plumbers and Steam Fitters Local 33 | Opposing | GA88 |
| Eric Goranson | Plumbing Heating & Cooling Contractors of IA | Opposing | GA88 |
| Amy Campbell | Professional Developers of Iowa (PDI) | Undecided | GA88 |
| Craig Patterson | Professional Developers of Iowa (PDI) | Undecided | GA88 |
| David Adelman | Sheet Metal Contractors of Iowa | Opposing | GA88 |
| Frank Chiodo | Sheet Metal Contractors of Iowa | Opposing | GA88 |
| Matt Hinch | Sheet Metal Contractors of Iowa | Opposing | GA88 |
| Sara Allen | Sheet Metal Contractors of Iowa | Opposing | GA88 |