He's opposed to same-sex marriage but also in favor of a federalist solution. I think the GOP's best bet on this question is the exact formula McCain has laid out. I can live within a coalition with people who oppose my right to marry the man I love. But I cannot live within a coalition that would amend the federal constitution to forbid it for ever in every state.
This article available online at:
http://www.theatlantic.com/daily-dish/archive/2007/03/mccain-on-marriage/229730/
