Plaintiff Rev. Maurice Blanchard, of Louisville, Ky., makes heart with his hands behind plaintiff plaintiff James Obergefell of Ohio, right, as they stand outside of the Supreme Court in Washington today, following a hearing on same-sex marriages. (AP Photo/Cliff Owen)

The Supreme Court appeared both cautious and deeply divided Tuesday on whether to change an opposite-sex definition of marriage that several justices said has existed for "millennia." The court's conservatives indicated within minutes that a victory for same-sex couples on what has emerged as the major civil rights issue of the early 21st century would not come easily, as many had anticipated. "The word that keeps coming back to me is 'millennia,'" Justice Anthony Kennedy, who often casts the deciding vote on the court, said during oral arguments in the landmark challenge to state laws prohibiting same-sex marriages. "This definition has been with us for millennia. It's very difficult for the court to say, 'Oh well, we know better'"/USA Today. More here.

Question: How do you predict that this decision will go?