South Dakota Amendment C (2006)

South Dakota Amendment C of (2006) is a so-called "defense of marriage amendment" that amended the South Dakota Constitution to make it unconstitutional for the state to recognize or perform same-sex marriages, or to recognize civil unions, domestic partnerships, or other quasi-martial relationships regardless of gender. The referendum was approved on 7 November, 2006 by 52% of the state's voters.

The text of the adopted amendment states:

"Only marriage between a man and a woman shall be valid or recognized in South Dakota. The uniting of two or more persons in a civil union, domestic partnership, or other quasi-marital relationship shall not be valid or recognized in South Dakota."