| Brad Epperly | Ames Chamber of Commerce | Undecided | GA89 |
| Dustin Miller | Ames Chamber of Commerce | Undecided | GA89 |
| Kate Hansen | Center for Rural Affairs | Supporting | GA89 |
| Gary Grant | City of Cedar Rapids | Opposing | GA89 |
| Gary Grant | City of Cedar Rapids | Withdrawn | GA89 |
| Gary Grant | City of Cedar Rapids | Undecided | GA89 |
| Larry Murphy | City of Cedar Rapids | Opposing | GA89 |
| Larry Murphy | City of Cedar Rapids | Withdrawn | GA89 |
| Larry Murphy | City of Cedar Rapids | Undecided | GA89 |
| Meghan Malloy | City of Cedar Rapids | Opposing | GA89 |
| Meghan Malloy | City of Cedar Rapids | Withdrawn | GA89 |
| Meghan Malloy | City of Cedar Rapids | Undecided | GA89 |
| Doug Struyk | City of Des Moines | Undecided | GA89 |
| Jen Schulte | City of Des Moines | Undecided | GA89 |
| Jennifer Dorman | City of Des Moines | Undecided | GA89 |
| Jim Carney | City of Des Moines | Undecided | GA89 |
| Sarah Chicken | City of Des Moines | Undecided | GA89 |
| Cyndi Pederson | Common Good Iowa | Opposing | GA89 |
| Kelli Soyer | Common Good Iowa | Opposing | GA89 |
| Mike Owen | Common Good Iowa | Opposing | GA89 |
| Natalie Veldhouse | Common Good Iowa | Opposing | GA89 |
| Sheila Hansen | Common Good Iowa | Opposing | GA89 |
| Drew Kamp | Council Bluffs Chamber of Commerce | Supporting | GA89 |
| Drew Kamp | Council Bluffs Chamber of Commerce | Undecided | GA89 |
| Ryan Sempf | Dubuque Area Chamber of Commerce | Undecided | GA89 |
| Marc Beltrame | Ducks Unlimited, Inc. | Supporting | GA89 |
| Andrea Woodard | Greater Des Moines Partnership | Undecided | GA89 |
| Brad Epperly | Greater Des Moines Partnership | Undecided | GA89 |
| Dustin Miller | Greater Des Moines Partnership | Undecided | GA89 |
| Chelsea Hoye | Iowa Alliance of YMCA's | Undecided | GA89 |
| Emilee Harris-Puricelli | Iowa Alliance of YMCA's | Undecided | GA89 |
| Nick Laning | Iowa Alliance of YMCA's | Undecided | GA89 |
| Threase Harms | Iowa Alliance of YMCA's | Undecided | GA89 |
| Brad Hartkopf | Iowa Association of Business and Industry (ABI) | Undecided | GA89 |
| John Davis | Iowa Association of Business and Industry (ABI) | Undecided | GA89 |
| Michael Ralston | Iowa Association of Business and Industry (ABI) | Undecided | GA89 |
| Nicole Crain | Iowa Association of Business and Industry (ABI) | Undecided | GA89 |
| Steffi Lee | Iowa Association of Business and Industry (ABI) | Undecided | GA89 |
| Amy Campbell | Iowa Association of County Conservation Boards | Supporting | GA89 |
| Craig Patterson | Iowa Association of County Conservation Boards | Supporting | GA89 |
| Alex Cutchey | Iowa Association of Municipal Utilities | Supporting | GA89 |
| Alex Cutchey | Iowa Association of Municipal Utilities | Undecided | GA89 |
| Brad Epperly | Iowa Automobile Dealers Association | Undecided | GA89 |
| Dustin Miller | Iowa Automobile Dealers Association | Undecided | GA89 |
| Nick Laning | Iowa Bicycle Coalition | Supporting | GA89 |
| Nick Laning | Iowa Bicycle Coalition | Undecided | GA89 |
| Threase Harms | Iowa Bicycle Coalition | Supporting | GA89 |
| Threase Harms | Iowa Bicycle Coalition | Undecided | GA89 |
| Eric Goranson | Iowa Bowhunters Association | Supporting | GA89 |
| Tom Chapman | Iowa Catholic Conference | Undecided | GA89 |
| Kellie Paschke | Iowa Cattlemen's Association | Opposing | GA89 |
| Kelly Meyers | Iowa Cattlemen's Association | Opposing | GA89 |
| Logan Murray | Iowa Cattlemen's Association | Opposing | GA89 |
| Troy Skinner | Iowa Cattlemen's Association | Opposing | GA89 |
| Brad Epperly | Iowa Chamber Alliance | Supporting | GA89 |
| Brad Epperly | Iowa Chamber Alliance | Undecided | GA89 |
| Dustin Miller | Iowa Chamber Alliance | Supporting | GA89 |
| Dustin Miller | Iowa Chamber Alliance | Undecided | GA89 |
| Pam Mackey-Taylor | Iowa Chapter of Sierra Club | Opposing | GA89 |
| Sydney Gangestad | Iowa Confluence Water Trails | Undecided | GA89 |
| Tim Coonan | Iowa Confluence Water Trails | Undecided | GA89 |
| Jim Obradovich | Iowa Conservation Alliance | Supporting | GA89 |
| Robert Mulqueen | Iowa Conservation Alliance | Supporting | GA89 |
| Colin Tadlock | Iowa Department of Agriculture & Land Stewardship | Undecided | GA89 |
| Todd Coffelt | Iowa Dept. of Natural Resources | Undecided | GA89 |
| Chip Baltimore | Iowa Environmental Council | Undecided | GA89 |
| Kevin Kuhle | Iowa Farm Bureau Federation | Opposing | GA89 |
| Matt Gronewald | Iowa Farm Bureau Federation | Opposing | GA89 |
| Matthew Steinfeldt | Iowa Farm Bureau Federation | Opposing | GA89 |
| Emilee Harris-Puricelli | Iowa Farmers Union | Opposing | GA89 |
| Threase Harms | Iowa Farmers Union | Undecided | GA89 |
| Peter Hird | Iowa Federation of Labor, AFL-CIO | Opposing | GA89 |
| Alan Kemp | Iowa League of Cities | Undecided | GA89 |
| Daniel Stalder | Iowa League of Cities | Undecided | GA89 |
| Robert Palmer | Iowa League of Cities | Undecided | GA89 |
| Amy Campbell | Iowa Natural Heritage Foundation | Supporting | GA89 |
| Anna Gray | Iowa Natural Heritage Foundation | Supporting | GA89 |
| Craig Patterson | Iowa Natural Heritage Foundation | Supporting | GA89 |
| Amy Campbell | Iowa Public Transit Association (IPT) | Undecided | GA89 |
| Craig Patterson | Iowa Public Transit Association (IPT) | Undecided | GA89 |
| Chelsea Hoye | Iowa Rivers Revival | Undecided | GA89 |
| Emilee Harris-Puricelli | Iowa Rivers Revival | Undecided | GA89 |
| Nick Laning | Iowa Rivers Revival | Undecided | GA89 |
| Threase Harms | Iowa Rivers Revival | Undecided | GA89 |
| Brad Epperly | Iowa Society of Certified Public Accountants | Undecided | GA89 |
| Dustin Miller | Iowa Society of Certified Public Accountants | Undecided | GA89 |
| Doug Struyk | Iowa Soybean Association | Supporting | GA89 |
| Jennifer Dorman | Iowa Soybean Association | Supporting | GA89 |
| Jim Carney | Iowa Soybean Association | Supporting | GA89 |
| Mike Heller | Iowa State Association of Assessors | Undecided | GA89 |
| Jamie Cashman | Iowa State Association of Counties | Undecided | GA89 |
| Kristi Harshbarger | Iowa State Association of Counties | Undecided | GA89 |
| Lucas Beenken | Iowa State Association of Counties | Undecided | GA89 |
| William Peterson | Iowa State Association of Counties | Undecided | GA89 |
| Jamie Cashman | Iowa State Association of County Supervisors | Undecided | GA89 |
| Kristi Harshbarger | Iowa State Association of County Supervisors | Undecided | GA89 |
| Lucas Beenken | Iowa State Association of County Supervisors | Undecided | GA89 |
| William Peterson | Iowa State Association of County Supervisors | Undecided | GA89 |
| David Adelman | Iowa Travel Industry Partners | Supporting | GA89 |
| Frank Chiodo | Iowa Travel Industry Partners | Supporting | GA89 |
| Lillie Brady | Iowa Travel Industry Partners | Supporting | GA89 |
| Matt Hinch | Iowa Travel Industry Partners | Supporting | GA89 |
| Sara Allen | Iowa Travel Industry Partners | Supporting | GA89 |
| David Adelman | Iowa Water Land Legacy Coalition | Supporting | GA89 |
| Frank Chiodo | Iowa Water Land Legacy Coalition | Supporting | GA89 |
| Lillie Brady | Iowa Water Land Legacy Coalition | Supporting | GA89 |
| Matt Hinch | Iowa Water Land Legacy Coalition | Supporting | GA89 |
| Sara Allen | Iowa Water Land Legacy Coalition | Supporting | GA89 |
| Scott Newhard | Iowa Water Land Legacy Coalition | Supporting | GA89 |
| MIke Delaney | Izaak Walton League - Iowa Division | Supporting | GA89 |
| Amy Campbell | League of Women Voters of Iowa | Supporting | GA89 |
| Craig Patterson | League of Women Voters of Iowa | Supporting | GA89 |
| Gary Grant | Linn County Board of Supervisors | Opposing | GA89 |
| Gary Grant | Linn County Board of Supervisors | Withdrawn | GA89 |
| Gary Grant | Linn County Board of Supervisors | Undecided | GA89 |
| Larry Murphy | Linn County Board of Supervisors | Opposing | GA89 |
| Larry Murphy | Linn County Board of Supervisors | Withdrawn | GA89 |
| Larry Murphy | Linn County Board of Supervisors | Undecided | GA89 |
| Meghan Malloy | Linn County Board of Supervisors | Opposing | GA89 |
| Meghan Malloy | Linn County Board of Supervisors | Withdrawn | GA89 |
| Meghan Malloy | Linn County Board of Supervisors | Undecided | GA89 |
| Amy Campbell | Loess Hills Alliance | Undecided | GA89 |
| Craig Patterson | Loess Hills Alliance | Undecided | GA89 |
| Kellie Paschke | Marion County Board of Supervisors | Undecided | GA89 |
| Kelly Meyers | Marion County Board of Supervisors | Undecided | GA89 |
| Logan Murray | Marion County Board of Supervisors | Undecided | GA89 |
| Troy Skinner | Marion County Board of Supervisors | Undecided | GA89 |
| John Hall | Marshalltown Area Chamber of Commerce | Undecided | GA89 |
| Ben Hammes | Master Builders of Iowa | Supporting | GA89 |
| Julie Smith | Master Builders of Iowa | Supporting | GA89 |
| David Adelman | Metropolitan Coalition | Undecided | GA89 |
| Frank Chiodo | Metropolitan Coalition | Undecided | GA89 |
| Lillie Brady | Metropolitan Coalition | Undecided | GA89 |
| Matt Hinch | Metropolitan Coalition | Undecided | GA89 |
| Sara Allen | Metropolitan Coalition | Undecided | GA89 |
| Amy Campbell | Okoboji Tourism | Undecided | GA89 |
| Craig Patterson | Okoboji Tourism | Undecided | GA89 |
| Eric Goranson | Pheasants Forever, Inc. & Quail Forever | Supporting | GA89 |
| Amy Campbell | Polk County - Board of Supervisors | Undecided | GA89 |
| Craig Patterson | Polk County - Board of Supervisors | Undecided | GA89 |
| Amy Campbell | Professional Developers of Iowa (PDI) | Undecided | GA89 |
| Craig Patterson | Professional Developers of Iowa (PDI) | Undecided | GA89 |
| Brad Epperly | Quad Cities Chamber of Commerce | Undecided | GA89 |
| Dustin Miller | Quad Cities Chamber of Commerce | Undecided | GA89 |
| Amber Markham | The Nature Conservancy | Supporting | GA89 |
| Doug Struyk | The Nature Conservancy | Supporting | GA89 |
| Jennifer Dorman | The Nature Conservancy | Supporting | GA89 |
| Jim Carney | The Nature Conservancy | Supporting | GA89 |
| BRITTANY LUMLEY | Travel Federation of Iowa | Supporting | GA89 |
| Jeffrey Boeyink | Travel Federation of Iowa | Supporting | GA89 |
| Taylor McDonald | Travel Federation of Iowa | Supporting | GA89 |
| Gary Grant | Urban County Coalition | Opposing | GA89 |
| Gary Grant | Urban County Coalition | Withdrawn | GA89 |
| Gary Grant | Urban County Coalition | Undecided | GA89 |
| Larry Murphy | Urban County Coalition | Opposing | GA89 |
| Larry Murphy | Urban County Coalition | Withdrawn | GA89 |
| Larry Murphy | Urban County Coalition | Undecided | GA89 |
| Meghan Malloy | Urban County Coalition | Opposing | GA89 |
| Meghan Malloy | Urban County Coalition | Withdrawn | GA89 |
| Meghan Malloy | Urban County Coalition | Undecided | GA89 |
| Jake Ketzner | Urbandale Water Utility | Undecided | GA89 |
| Larry Blixt | Urbandale Water Utility | Undecided | GA89 |
| Mike Heller | Waste Management, Inc. | Undecided | GA89 |