| Election Date | State | Title | Outcome |
|---|---|---|---|
| Nov. 4, 2008 | Missouri | Constitutional Amendment 2: Grants and Loans for Storm Water Control | Passed |
| Nov. 8, 2016 | Missouri | SJR 1: Constitutional Amendment 1 | Passed |
| Aug. 4, 2026 | Missouri | Amendment 1: Amendment 1, Sales Tax for Parks and Conservation Amendment | Passed |