Defense of Marriage Act
What It Does: Defines "marriage" as a relationship between one man and one woman, and a "spouse" as a husband or wife of the opposite sex. Allows states to refuse to recognize same-sex marriages performed in another state, seen by some as a preemptive strike against the expected legalization of gay marriage in Hawaii.
Pro and Con: Proponents of DOMA argue that most Americans do not support same-sex marriages, which threaten traditional values and the already crumbling family structure. Opponents counter that marriage is a civil right--with numerous accompanying legal rights--that should be available to both gays and straights.