The full faith and credit clause

The full faith and credit clause (Article IV, Section 1) requires that states recognize the legal decisions of other states (please see page 66 of E-Text). The framers of the Constitution believed that this concession was necessary to ensure that the Union functions smoothly.
In what ways might the debate over same-sex marriages challenge the full faith and credit clause? Should states be able to override the decisions of other states in this area but not in others? Why or why not?