| Election Date | State | Title | Outcome |
|---|---|---|---|
| Nov. 4, 2008 | Arkansas | Proposed Initiative Act 1: An Act Providing that an Individual who is Cohabiting Outside of a Valid Marriage May Not Adopt or be a Foster Parent of a Child Less than Eighteen Years Old | Passed |
| Nov. 4, 2008 | Arizona | Proposition 102: Marriage | Passed |
| Nov. 4, 2008 | California | Proposition 8: Eliminates Right of Same-Sex Couples to Marry. Initiative Constitutional Amendment. | Passed |
| Nov. 4, 2008 | Colorado | Amendment 46: Discrimination and Preferential Treatment by the State | Failed |
| Nov. 4, 2008 | Florida | Constitutional Amendment 2: Florida Marriage Protection Amendment | Passed |