| Chelsea Hoye | American Legion of Iowa | Supporting | GA90 |
| Nick Laning | American Legion of Iowa | Supporting | GA90 |
| Threase Harms | American Legion of Iowa | Supporting | GA90 |
| Jake Highfill | American Petroleum Institute | Supporting | GA90 |
| Tony Phillips | American Petroleum Institute | Supporting | GA90 |
| Drew Klein | Americans For Prosperity | Undecided | GA90 |
| Tyler Raygor | Americans For Prosperity | Undecided | GA90 |
| Brad Epperly | Ames Regional Economic Alliance | Undecided | GA90 |
| Dustin Miller | Ames Regional Economic Alliance | Undecided | GA90 |
| Gary Grant | Cedar Rapids Metro Economic Alliance | Undecided | GA90 |
| Kate Walton | City of Bettendorf | Undecided | GA90 |
| Madeleine Bradley | City of Bettendorf | Undecided | GA90 |
| Matt Eide | City of Bettendorf | Undecided | GA90 |
| Gary Grant | City of Cedar Rapids | Opposing | GA90 |
| Larry Murphy | City of Cedar Rapids | Opposing | GA90 |
| Emilee Harris-Puricelli | City of Des Moines | Undecided | GA90 |
| Jen Schulte | City of Des Moines | Undecided | GA90 |
| Sydney Gangestad | City of West Des Moines | Undecided | GA90 |
| Tim Coonan | City of West Des Moines | Undecided | GA90 |
| Emily Piper | Clarke County Resevoir Commission | Undecided | GA90 |
| Kelli Soyer | Common Good Iowa | Opposing | GA90 |
| Mike Owen | Common Good Iowa | Opposing | GA90 |
| Natalie Veldhouse | Common Good Iowa | Opposing | GA90 |
| Sheila Hansen | Common Good Iowa | Opposing | GA90 |
| Kent Keene | Congressional Sportsmen's Foundation | Supporting | GA90 |
| Drew Kamp | Council Bluffs Chamber of Commerce | Undecided | GA90 |
| Clara Wulfsen | Department of Revenue | Undecided | GA90 |
| David Adelman | Des Moines Area Regional Transit | Undecided | GA90 |
| Frank Chiodo | Des Moines Area Regional Transit | Undecided | GA90 |
| Lillie Brady | Des Moines Area Regional Transit | Undecided | GA90 |
| Matt Hinch | Des Moines Area Regional Transit | Undecided | GA90 |
| Sara Allen | Des Moines Area Regional Transit | Undecided | GA90 |
| Chelsea Hoye | Des Moines Water Works | Undecided | GA90 |
| Nick Laning | Des Moines Water Works | Undecided | GA90 |
| Threase Harms | Des Moines Water Works | Undecided | GA90 |
| Ryan Sempf | Dubuque Area Chamber of Commerce | Undecided | GA90 |
| John Hirl | Ducks Unlimited, Inc. | Supporting | GA90 |
| Marc Beltrame | Ducks Unlimited, Inc. | Supporting | GA90 |
| Josh Mandelbaum | Environmental Law and Policy Center | Undecided | GA90 |
| Steve Falck | Environmental Law and Policy Center | Undecided | GA90 |
| Andrea Woodard | Greater Des Moines Partnership | Undecided | GA90 |
| Brad Epperly | Greater Des Moines Partnership | Undecided | GA90 |
| Dustin Miller | Greater Des Moines Partnership | Undecided | GA90 |
| Kate Walton | Grow Clinton County | Undecided | GA90 |
| Madeleine Bradley | Grow Clinton County | Undecided | GA90 |
| Matt Eide | Grow Clinton County | Undecided | GA90 |
| Eric Goranson | Habitat for Humanity of Iowa | Undecided | GA90 |
| James Piazza, Jr. | Heavy Highway Contractors Association | Undecided | GA90 |
| Michael Triplett | Iowa Alliance of Surety Companies | Undecided | GA90 |
| Brad Hartkopf | Iowa Association of Business and Industry (ABI) | Supporting | GA90 |
| Brad Hartkopf | Iowa Association of Business and Industry (ABI) | Undecided | GA90 |
| John Davis | Iowa Association of Business and Industry (ABI) | Supporting | GA90 |
| John Davis | Iowa Association of Business and Industry (ABI) | Undecided | GA90 |
| Michael Ralston | Iowa Association of Business and Industry (ABI) | Supporting | GA90 |
| Michael Ralston | Iowa Association of Business and Industry (ABI) | Undecided | GA90 |
| Nicole Crain | Iowa Association of Business and Industry (ABI) | Supporting | GA90 |
| Nicole Crain | Iowa Association of Business and Industry (ABI) | Undecided | GA90 |
| Amy Campbell | Iowa Association of County Conservation Boards | Undecided | GA90 |
| Craig Patterson | Iowa Association of County Conservation Boards | Undecided | GA90 |
| Julie Smith | Iowa Association of Water Agencies | Undecided | GA90 |
| Nick Laning | Iowa Bicycle Coalition | Undecided | GA90 |
| Nick Laning | Iowa Bicycle Coalition | Supporting | GA90 |
| Threase Harms | Iowa Bicycle Coalition | Undecided | GA90 |
| Threase Harms | Iowa Bicycle Coalition | Supporting | GA90 |
| Eric Goranson | Iowa Bowhunters Association | Supporting | GA90 |
| Larry Murphy | Iowa Catholic Conference | Undecided | GA90 |
| Tom Chapman | Iowa Catholic Conference | Undecided | GA90 |
| Kellie Paschke | Iowa Cattlemen's Association | Opposing | GA90 |
| Kellie Paschke | Iowa Cattlemen's Association | Undecided | GA90 |
| Kelly Meyers | Iowa Cattlemen's Association | Opposing | GA90 |
| Kelly Meyers | Iowa Cattlemen's Association | Undecided | GA90 |
| Troy Skinner | Iowa Cattlemen's Association | Opposing | GA90 |
| Troy Skinner | Iowa Cattlemen's Association | Undecided | GA90 |
| Brad Epperly | Iowa Chamber Alliance | Undecided | GA90 |
| Dustin Miller | Iowa Chamber Alliance | Undecided | GA90 |
| Pam Mackey-Taylor | Iowa Chapter of Sierra Club | Opposing | GA90 |
| Pam Mackey-Taylor | Iowa Chapter of Sierra Club | Undecided | GA90 |
| Jefferson Fink | Iowa Conservation Alliance | Supporting | GA90 |
| Jim Obradovich | Iowa Conservation Alliance | Supporting | GA90 |
| Haley Hook | Iowa Department of Agriculture & Land Stewardship | Undecided | GA90 |
| Todd Coffelt | Iowa Dept. of Natural Resources | Undecided | GA90 |
| Doug Struyk | Iowa Drainage District Association | Undecided | GA90 |
| Jennifer Dorman | Iowa Drainage District Association | Undecided | GA90 |
| Jim Carney | Iowa Drainage District Association | Undecided | GA90 |
| John Torbert | Iowa Drainage District Association | Undecided | GA90 |
| Mona Bond | Iowa Drainage District Association | Undecided | GA90 |
| Deanna Triplett | Iowa Economic Development Authority | Undecided | GA90 |
| Chelsea Hoye | Iowa Environmental Council | Undecided | GA90 |
| Threase Harms | Iowa Environmental Council | Undecided | GA90 |
| Kevin Kuhle | Iowa Farm Bureau Federation | Opposing | GA90 |
| Matt Gronewald | Iowa Farm Bureau Federation | Opposing | GA90 |
| Matthew Steinfeldt | Iowa Farm Bureau Federation | Opposing | GA90 |
| Chelsea Hoye | Iowa Farmers Union | Undecided | GA90 |
| Nick Laning | Iowa Farmers Union | Undecided | GA90 |
| Threase Harms | Iowa Farmers Union | Undecided | GA90 |
| Michael Triplett | Iowa Funeral Directors Association | Undecided | GA90 |
| Bob Rafferty | Iowa Housing Partnership | Undecided | GA90 |
| Alan Kemp | Iowa League of Cities | Opposing | GA90 |
| Daniel Stalder | Iowa League of Cities | Opposing | GA90 |
| Robert Palmer | Iowa League of Cities | Opposing | GA90 |
| Amy Campbell | Iowa Natural Heritage Foundation | Supporting | GA90 |
| Anna Gray | Iowa Natural Heritage Foundation | Supporting | GA90 |
| Craig Patterson | Iowa Natural Heritage Foundation | Supporting | GA90 |
| Larry Murphy | Iowa Police Chief Association (FKA Iowa Police Executive Forum) | Opposing | GA90 |
| Larry Murphy | Iowa Police Chief Association (FKA Iowa Police Executive Forum) | Withdrawn | GA90 |
| Larry Murphy | Iowa Police Chief Association (FKA Iowa Police Executive Forum) | Undecided | GA90 |
| David Adelman | Iowa Real Estate Developers Association | Undecided | GA90 |
| Frank Chiodo | Iowa Real Estate Developers Association | Undecided | GA90 |
| Lillie Brady | Iowa Real Estate Developers Association | Undecided | GA90 |
| Matt Hinch | Iowa Real Estate Developers Association | Undecided | GA90 |
| Sara Allen | Iowa Real Estate Developers Association | Undecided | GA90 |
| Mike Heller | Iowa Renewable Fuels Association (IRF) | Undecided | GA90 |
| Emily Piper | Iowa Rural Water Association | Undecided | GA90 |
| Brad Epperly | Iowa Society of Certified Public Accountants | Undecided | GA90 |
| Dustin Miller | Iowa Society of Certified Public Accountants | Undecided | GA90 |
| Doug Struyk | Iowa Soybean Association | Supporting | GA90 |
| Jennifer Dorman | Iowa Soybean Association | Supporting | GA90 |
| Jim Carney | Iowa Soybean Association | Supporting | GA90 |
| Mike Heller | Iowa State Association of Assessors | Undecided | GA90 |
| Jamie Cashman | Iowa State Association of Counties | Undecided | GA90 |
| Kristi Harshbarger | Iowa State Association of Counties | Undecided | GA90 |
| Lucas Beenken | Iowa State Association of Counties | Undecided | GA90 |
| William Peterson | Iowa State Association of Counties | Undecided | GA90 |
| Jamie Cashman | Iowa State Association of County Auditors | Undecided | GA90 |
| Kristi Harshbarger | Iowa State Association of County Auditors | Undecided | GA90 |
| Lucas Beenken | Iowa State Association of County Auditors | Undecided | GA90 |
| William Peterson | Iowa State Association of County Auditors | Undecided | GA90 |
| Jamie Cashman | Iowa State Association of County Supervisors | Undecided | GA90 |
| Kristi Harshbarger | Iowa State Association of County Supervisors | Undecided | GA90 |
| Lucas Beenken | Iowa State Association of County Supervisors | Undecided | GA90 |
| William Peterson | Iowa State Association of County Supervisors | Undecided | GA90 |
| Mike Heller | Iowa State Snowmobile Association | Undecided | GA90 |
| Tom Sands | Iowa Taxpayers Association | Supporting | GA90 |
| David Adelman | Iowa Water Land Legacy Coalition | Supporting | GA90 |
| David Adelman | Iowa Water Land Legacy Coalition | Undecided | GA90 |
| Frank Chiodo | Iowa Water Land Legacy Coalition | Supporting | GA90 |
| Frank Chiodo | Iowa Water Land Legacy Coalition | Undecided | GA90 |
| Lillie Brady | Iowa Water Land Legacy Coalition | Supporting | GA90 |
| Lillie Brady | Iowa Water Land Legacy Coalition | Undecided | GA90 |
| Matt Hinch | Iowa Water Land Legacy Coalition | Supporting | GA90 |
| Matt Hinch | Iowa Water Land Legacy Coalition | Undecided | GA90 |
| Sara Allen | Iowa Water Land Legacy Coalition | Supporting | GA90 |
| Sara Allen | Iowa Water Land Legacy Coalition | Undecided | GA90 |
| Scott Newhard | Iowa Water Land Legacy Coalition | Supporting | GA90 |
| Scott Newhard | Iowa Water Land Legacy Coalition | Undecided | GA90 |
| Michael Triplett | Iowans For Alternatives To Smoking And Tobacco | Undecided | GA90 |
| Chris Hagenow | Iowans for Tax Relief | Supporting | GA90 |
| Jake Highfill | Iowans for Tax Relief | Supporting | GA90 |
| Victoria Sinclair | Iowans for Tax Relief | Supporting | GA90 |
| Dane Schumann | Izaak Walton League - Iowa Division | Undecided | GA90 |
| Gary Grant | Linn County Board of Supervisors | Opposing | GA90 |
| Larry Murphy | Linn County Board of Supervisors | Opposing | GA90 |
| Kellie Paschke | Marion County Board of Supervisors | Undecided | GA90 |
| Kelly Meyers | Marion County Board of Supervisors | Undecided | GA90 |
| Troy Skinner | Marion County Board of Supervisors | Undecided | GA90 |
| John Hall | Marshalltown Area Chamber of Commerce | Undecided | GA90 |
| Ben Hammes | Master Builders of Iowa | Undecided | GA90 |
| Julie Smith | Master Builders of Iowa | Undecided | GA90 |
| Angela Caulk | Metropolitan Coalition | Undecided | GA90 |
| David Adelman | Metropolitan Coalition | Undecided | GA90 |
| Frank Chiodo | Metropolitan Coalition | Undecided | GA90 |
| Lillie Brady | Metropolitan Coalition | Undecided | GA90 |
| Logan Murray | Metropolitan Coalition | Undecided | GA90 |
| Matt Hinch | Metropolitan Coalition | Undecided | GA90 |
| Noah Tabor | Metropolitan Coalition | Undecided | GA90 |
| Sara Allen | Metropolitan Coalition | Undecided | GA90 |
| Onnalee Gettler | MidAmerican Energy Company | Undecided | GA90 |
| Cody Carlson | National Federation of Independent Business (NFIB /IA) | Supporting | GA90 |
| Craig Walter | Northern Natural Gas Company | Supporting | GA90 |
| Matt Hinch | Northern Natural Gas Company | Supporting | GA90 |
| Mike Heller | Petroleum Marketers Management Insurance Company (PMMIC) | Undecided | GA90 |
| Eric Goranson | Pheasants Forever, Inc. & Quail Forever | Supporting | GA90 |
| Amy Campbell | Professional Developers of Iowa (PDI) | Undecided | GA90 |
| Craig Patterson | Professional Developers of Iowa (PDI) | Undecided | GA90 |
| Brad Epperly | Quad Cities Chamber of Commerce | Undecided | GA90 |
| Dustin Miller | Quad Cities Chamber of Commerce | Undecided | GA90 |
| Michael Triplett | Self Storage Association | Undecided | GA90 |
| Michael Triplett | T-Mobile | Undecided | GA90 |
| Amber Markham | The Nature Conservancy | Supporting | GA90 |
| Doug Struyk | The Nature Conservancy | Supporting | GA90 |
| Jennifer Dorman | The Nature Conservancy | Supporting | GA90 |
| Jim Carney | The Nature Conservancy | Supporting | GA90 |
| Michael Triplett | Union Pacific Railroad | Undecided | GA90 |
| Cyndi Pederson | United Way of Central Iowa | Undecided | GA90 |
| Dave Stone | United Way of Central Iowa | Undecided | GA90 |
| John Pederson | United Way of Central Iowa | Undecided | GA90 |
| Gary Grant | Urban County Coalition | Opposing | GA90 |
| Larry Murphy | Urban County Coalition | Opposing | GA90 |
| Jake Ketzner | Urbandale Water Utility | Undecided | GA90 |
| Larry Blixt | Urbandale Water Utility | Undecided | GA90 |
| Nick Boeyink | Urbandale Water Utility | Undecided | GA90 |
| Mike Heller | Waste Management, Inc. | Undecided | GA90 |
| Brandon Geib | Wellmark, Inc. | Undecided | GA90 |
| Scott Sundstrom | Wellmark, Inc. | Undecided | GA90 |
| Brad Epperly | res | Supporting | GA90 |
| Brad Epperly | res | Undecided | GA90 |
| Dustin Miller | res | Supporting | GA90 |
| Dustin Miller | res | Undecided | GA90 |