| Daniel Zeno | American Civil Liberties Union of Iowa (ACLU-IA) | Supporting | GA88 |
| Mark Stringer | American Civil Liberties Union of Iowa (ACLU-IA) | Supporting | GA88 |
| Pete McRoberts | American Civil Liberties Union of Iowa (ACLU-IA) | Supporting | GA88 |
| Drew Klein | Americans For Prosperity | Supporting | GA88 |
| Tyler Raygor | Americans For Prosperity | Supporting | GA88 |
| Gary Grant | City of Cedar Rapids | Opposing | GA88 |
| Gary Grant | City of Cedar Rapids | Withdrawn | GA88 |
| Gary Grant | City of Cedar Rapids | Undecided | GA88 |
| Larry Murphy | City of Cedar Rapids | Opposing | GA88 |
| Larry Murphy | City of Cedar Rapids | Withdrawn | GA88 |
| Larry Murphy | City of Cedar Rapids | Undecided | GA88 |
| Meghan Malloy | City of Cedar Rapids | Opposing | GA88 |
| Meghan Malloy | City of Cedar Rapids | Withdrawn | GA88 |
| Meghan Malloy | City of Cedar Rapids | Undecided | GA88 |
| Alex Hassel | City of Des Moines | Undecided | GA88 |
| Doug Struyk | City of Des Moines | Undecided | GA88 |
| Jen Schulte | City of Des Moines | Undecided | GA88 |
| Jennifer Dorman | City of Des Moines | Undecided | GA88 |
| Jim Carney | City of Des Moines | Undecided | GA88 |
| Julie Smith | City of West Des Moines | Undecided | GA88 |
| Sydney Gangestad | City of West Des Moines | Undecided | GA88 |
| Tim Coonan | City of West Des Moines | Undecided | GA88 |
| Jeff Smith | Iowa Association of Community College Trustees | Undecided | GA88 |
| Jerry Fitzgerald | Iowa Association of Community College Trustees | Undecided | GA88 |
| Maggie Smith-Fitzgerald | Iowa Association of Community College Trustees | Undecided | GA88 |
| Matt Fitzgerald | Iowa Association of Community College Trustees | Undecided | GA88 |
| Julie Smith | Iowa Association of Municipal Utilities | Undecided | GA88 |
| Timothy Whipple | Iowa Association of Municipal Utilities | Undecided | GA88 |
| Jennifer Kingland | Iowa Association of Realtors | Supporting | GA88 |
| Emily Piper | Iowa Association of School Boards | Undecided | GA88 |
| Phil Jeneary | Iowa Association of School Boards | Undecided | GA88 |
| Pam Mackey-Taylor | Iowa Chapter of Sierra Club | Undecided | GA88 |
| Kelly Meyers | Iowa County Attorneys Association | Undecided | GA88 |
| Susan Cameron Daemen | Iowa County Attorneys Association | Undecided | GA88 |
| John Torbert | Iowa Drainage District Association | Undecided | GA88 |
| Mona Bond | Iowa Drainage District Association | Undecided | GA88 |
| Alan Kemp | Iowa League of Cities | Undecided | GA88 |
| Daniel Stalder | Iowa League of Cities | Undecided | GA88 |
| Robert Palmer | Iowa League of Cities | Undecided | GA88 |
| Brad Epperly | Iowa Newspaper Association | Undecided | GA88 |
| Dustin Miller | Iowa Newspaper Association | Undecided | GA88 |
| Katie Graham | Iowa Newspaper Association | Undecided | GA88 |
| Paula Dierenfeld | Iowa Newspaper Association | Undecided | GA88 |
| Jim Henter | Iowa Retail Federation | Supporting | GA88 |
| Jamie Cashman | Iowa State Association of Counties | Undecided | GA88 |
| Kristi Harshbarger | Iowa State Association of Counties | Undecided | GA88 |
| Lucas Beenken | Iowa State Association of Counties | Undecided | GA88 |
| William Peterson | Iowa State Association of Counties | Undecided | GA88 |
| Jamie Cashman | Iowa State Association of County Auditors | Undecided | GA88 |
| Kristi Harshbarger | Iowa State Association of County Auditors | Undecided | GA88 |
| Lucas Beenken | Iowa State Association of County Auditors | Undecided | GA88 |
| William Peterson | Iowa State Association of County Auditors | Undecided | GA88 |
| Jamie Cashman | Iowa State Association of County Supervisors | Undecided | GA88 |
| Kristi Harshbarger | Iowa State Association of County Supervisors | Undecided | GA88 |
| Lucas Beenken | Iowa State Association of County Supervisors | Undecided | GA88 |
| William Peterson | Iowa State Association of County Supervisors | Undecided | GA88 |
| Ernie Adkison | Iowans for Tax Relief | Supporting | GA88 |
| Victoria Sinclair | Iowans for Tax Relief | Supporting | GA88 |
| Jim Obradovich | Landlords of Iowa | Supporting | GA88 |
| Robert Mulqueen | Landlords of Iowa | Supporting | GA88 |
| Gary Grant | Linn County Board of Supervisors | Opposing | GA88 |
| Gary Grant | Linn County Board of Supervisors | Withdrawn | GA88 |
| Gary Grant | Linn County Board of Supervisors | Undecided | GA88 |
| Larry Murphy | Linn County Board of Supervisors | Opposing | GA88 |
| Larry Murphy | Linn County Board of Supervisors | Withdrawn | GA88 |
| Larry Murphy | Linn County Board of Supervisors | Undecided | GA88 |
| Meghan Malloy | Linn County Board of Supervisors | Opposing | GA88 |
| Meghan Malloy | Linn County Board of Supervisors | Withdrawn | GA88 |
| Meghan Malloy | Linn County Board of Supervisors | Undecided | GA88 |
| Amy Campbell | Polk County - Board of Supervisors | Undecided | GA88 |
| Brian Johnson | Polk County - Board of Supervisors | Undecided | GA88 |
| Gary Grant | Urban County Coalition | Opposing | GA88 |
| Gary Grant | Urban County Coalition | Withdrawn | GA88 |
| Gary Grant | Urban County Coalition | Undecided | GA88 |
| Larry Murphy | Urban County Coalition | Opposing | GA88 |
| Larry Murphy | Urban County Coalition | Withdrawn | GA88 |
| Larry Murphy | Urban County Coalition | Undecided | GA88 |
| Meghan Malloy | Urban County Coalition | Opposing | GA88 |
| Meghan Malloy | Urban County Coalition | Withdrawn | GA88 |
| Meghan Malloy | Urban County Coalition | Undecided | GA88 |