The justices could strike down DOMA's limits on federal recognition of same-sex marriage without upholding Proposition 8 and knocking down state-approved same-sex marriage bans.

CNN: Same-sex marriage and the Supreme Court: Key questions

He would not have merrily hopped on the same-sex marriage bandwagon without first carefully considering how the issue fit with his understanding of the laws of nature and nature's God, of the first things and first principles that conservatives of Reagan's generation spent years discussing at great length in their books and publications and conferences.

CNN: Ronald Reagan: Same-sex marriage advocate?

The issue is whether states without legalized same-sex marriage can recognize gay or lesbian weddings outside their borders.

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