Liberty and equality are not the same, and while the Supreme Court could reach for either legal principle in a ruling declaring Prop 8 unconstitutional, the principle that it ends up choosing could matter a great deal.

Obama must publicly acknowledge before the U.S. Supreme Court that the Constitution's guarantee of equal protection under the law applies to all couples who wish to marry, regardless of the state in which they live or whether their spouse is named Michael or Michelle.

Although this is ostensibly a legal case, it is really about competing narratives -- and there is nothing same-sex marriage opponents offer that comes close to the touching tale of Edie Windsor and her deceased wife, Thea Spyer. This case screams out for fair resolution.

The Supreme Court announced today that it will take up the Prop 8 case and one of the several DOMA cases. The next step in the review process for both cases is a scheduling order, which should come soon, laying out the date for oral arguments at the Supreme Court.

Today we rejoice in this opportunity for our Justices to affirm our Constitution's promises of liberty, equality and human dignity as we watch the arc of the moral universe continue to bend toward justice.

The Second Circuit has just issued its opinion in Windsor v. USA, striking down Section 3 of the Defense of Marriage Act (DOMA) as unconstitutional. Section 3 of DOMA limits federal recognition of marriage only to opposite-sex marriages.