| Melissa Speed | AFSCME Iowa Council 61 | Opposing | GA90 |
| Tyler Raygor | Americans For Prosperity | Supporting | GA90 |
| Gary Grant | City of Cedar Rapids | Undecided | GA90 |
| Larry Murphy | City of Cedar Rapids | Undecided | GA90 |
| Doug Struyk | City of Des Moines | Undecided | GA90 |
| Emilee Harris-Puricelli | City of Des Moines | Undecided | GA90 |
| Jen Schulte | City of Des Moines | Undecided | GA90 |
| Jennifer Dorman | City of Des Moines | Undecided | GA90 |
| Jim Carney | City of Des Moines | Undecided | GA90 |
| Anne Discher | Common Good Iowa | Opposing | GA90 |
| Mike Owen | Common Good Iowa | Opposing | GA90 |
| Sheila Hansen | Common Good Iowa | Opposing | GA90 |
| Josh Mandelbaum | Environmental Law and Policy Center | Opposing | GA90 |
| Steve Falck | Environmental Law and Policy Center | Withdrawn | GA90 |
| Steve Falck | Environmental Law and Policy Center | Opposing | GA90 |
| James Piazza, Jr. | Heavy Highway Contractors Association | Opposing | GA90 |
| Nick Laning | IBEW Iowa State Conference | Opposing | GA90 |
| Threase Harms | IBEW Iowa State Conference | Opposing | GA90 |
| Emily Piper | Iowa Association of School Boards | Undecided | GA90 |
| Michelle Johnson | Iowa Association of School Boards | Undecided | GA90 |
| Nick Laning | Iowa Chapter of the National Emergency Number Association (NENA) | Opposing | GA90 |
| Threase Harms | Iowa Chapter of the National Emergency Number Association (NENA) | Opposing | GA90 |
| Kelly Meyers | Iowa County Attorneys Association | Undecided | GA90 |
| Tom Ferguson | Iowa County Attorneys Association | Undecided | GA90 |
| Peter Hird | Iowa Federation of Labor, AFL-CIO | Opposing | GA90 |
| Alan Kemp | Iowa League of Cities | Undecided | GA90 |
| Daniel Stalder | Iowa League of Cities | Undecided | GA90 |
| Robert Palmer | Iowa League of Cities | Undecided | GA90 |
| Kellie Paschke | Iowa Peace Officers Association | Opposing | GA90 |
| Kelly Meyers | Iowa Peace Officers Association | Opposing | GA90 |
| Larry Murphy | Iowa Police Chief Association (FKA Iowa Police Executive Forum) | Undecided | GA90 |
| Christopher Rants | Iowa Professional Fire Fighters | Opposing | GA90 |
| John Cacciatore | Iowa Professional Fire Fighters | Opposing | GA90 |
| Lon Anderson | Iowa Professional Fire Fighters | Opposing | GA90 |
| Jon Murphy | Iowa State Building and Construction Trades | Opposing | GA90 |
| Kellie Paschke | Iowa State Education Association | Opposing | GA90 |
| Kelly Meyers | Iowa State Education Association | Opposing | GA90 |
| Melissa Peterson | Iowa State Education Association | Opposing | GA90 |
| Morgan Miller | Iowa State Education Association | Opposing | GA90 |
| Jeff Smith | Iowa State Police Association | Opposing | GA90 |
| Maggie Smith-Fitzgerald | Iowa State Police Association | Opposing | GA90 |
| Matt Fitzgerald | Iowa State Police Association | Opposing | GA90 |
| Dylan Gramlich | Laborers International Union of North America | Opposing | GA90 |
| Gary Grant | Linn County Board of Supervisors | Undecided | GA90 |
| Larry Murphy | Linn County Board of Supervisors | Undecided | GA90 |
| Andy Conlin | Mackinac Center Action | Supporting | GA90 |
| Dennis Tibben | Mackinac Center Action | Supporting | GA90 |
| Dane Schumann | North Central States Regional Council of Carpenters | Opposing | GA90 |
| Felicia Hilton | North Central States Regional Council of Carpenters | Opposing | GA90 |
| Nathaniel Arnold | Professional Educators of Iowa | Undecided | GA90 |
| Dave Daughton | Rural School Advocates of Iowa | Undecided | GA90 |
| Margaret Buckton | Rural School Advocates of Iowa | Undecided | GA90 |
| Dave Daughton | School Administrators of Iowa | Undecided | GA90 |
| Christopher Rants | State Police Officers Council | Opposing | GA90 |
| John Cacciatore | State Police Officers Council | Opposing | GA90 |
| Kelli Harrison | UAW Region 4 | Opposing | GA90 |
| Karl Schilling | United Professionals/UE | Opposing | GA90 |
| Dave Stone | United Way of Central Iowa | Opposing | GA90 |
| Gary Grant | Urban County Coalition | Undecided | GA90 |
| Larry Murphy | Urban County Coalition | Undecided | GA90 |
| Margaret Buckton | Urban Education Network of Iowa | Opposing | GA90 |
| John Strathman | VALOR Iowa | Undecided | GA90 |