Supreme Court Hearing Anti-Gay Marriage Proposition 8 Case This Week

March 25, 2013 -- Two potentially transformative cases about gay marriage will be argued at the Supreme Court this week. Justices have set aside two days to hear arguments and will release audio arguments the same day. Both cases will be decided by the end of June.

Here's what you need to know about the legal cases:

Click here to read about the second case, a challenge to the federal Defense of Marriage Act (DOMA).

First up is a challenge to California's Proposition 8, the controversial ballot initiative that defines marriage as between a man and a woman. Although the court could rule more narrowly, this case asks the big question of whether there is a fundamental right to gay marriage.

But there is a hurdle the justices must clear before they get to the merits of the case.

Proposition 8: The jurisdictional question:

The original sponsors of Prop 8 -- a group called Protectmarriage.com -- are defending the law because California officials refused to do so. The Supreme Court will explore whether the proponents have the legal right to be in court. If the court finds that the original sponsors have no "standing," then the case comes to a screeching halt, and the court will not reach the merits of the case.

"Although it may sometimes seem like a technicality, the Supreme Court wants to ensure that the federal courts only decide real, concrete disputes, brought by people that have been injured by the laws they want to challenge," said David Cruz, a professor of law at the University of Southern California Gould School of Law.

Charles J. Cooper, a lawyer representing Protectmarriage.com, argues in court papers that the California Supreme Court gave the sponsors the state's authority to defend the law and the U.S. Supreme Court should respect that in the case of Hollingsworth v. Perry.

Opponents of Prop 8 argue that "standing" requires an injury and proponents of Prop 8 cannot show they will be harmed if same-sex couples marry. "Proponents have never contended -- and do not contend before this Court -- that they would personally suffer any injury if gay men and lesbians were permitted to marry in California," write lawyers Theodore B. Olson and David Boies on behalf of gay couples who are challenging Prop 8.

Olson and Boies argue that if the court finds that proponents have no standing, then gay marriages should be able to resume in California.

The merits:

The central thrust of Cooper's arguments on the merits is that Californians who voted in favor of Prop 8 opted "in good faith" to preserve the traditional definition of marriage because they believe it continues to meaningfully serve important societal interests.

"In order to win, Cooper has to convince the court that there is a legitimate justification for Prop 8, that doesn't depend on hostility toward gay people," Cruz said.

Specifically, Cooper argues, marriage is "inextricably linked to the objective biological fact that opposite-sex couples and only such couples are capable of creating new life together and, therefore, are capable of furthering, or threatening, society's existential interests in responsible procreation and childbearing."

Cooper says that while marriage may serve "additional purposes" as long as "responsible procreation remains one of the purposes of marriage," plaintiffs cannot prevail.

He says that Prop 8 leaves undisturbed expansive domestic partnership laws that provide gays and lesbians with "some of the most comprehensive civil rights protections in the nation."