Here's an excerpt of an article about this subject:

MIA On Gay Marriage
By Eugene Robinson
Friday, May 8, 2009

Believe it or not, often I can see the other side of an argument. I know that tough gun control laws save lives and make our communities safer, for example, but I also see clarity in the Second Amendment. I support affirmative action, but I realize that providing opportunity to some worthy individuals can mean denying opportunity to others. Thinking about some issues involves discerning among subtly graded shades of gray.

On some issues, though, I really don't see anything but black and white. Among them is the "question" of granting full equal rights to gay and lesbian Americans, which really isn't a question at all. It's a long-overdue imperative, one that the nation is finally beginning to acknowledge.

Before his inauguration, President Obama called himself a "fierce advocate of equality for gay and lesbian Americans." Now, with the same-sex marriage issue percolating in state after state and with the Pentagon's "don't ask, don't tell" policy ripe for repeal, it's time for Obama to put some of his political capital where his rhetoric is.

On Wednesday, Maine became the fifth state to legalize gay marriage; similar legislation in New Hampshire has been sent to the governor. Politicians in Washington who want to avoid what they see as a dangerous controversy have a convenient escape: They can say that the marriage issue should be left to the states and that the question of whether a legal gay marriage in one state should be recognized everywhere has already been addressed by Congress and ultimately will be settled by the courts.

But that's a dodge, not a stance. It certainly can't be confused with leadership.

Favoring "civil unions" that accord all the rights and benefits of marriage -- but that withhold the word marriage, and with it, I guess, society's approval -- amounts to another dodge. I'm concerned here with the way the law sees the relationship, not the way any particular church or religious leader sees it; that's for worshipers, clergy and the Almighty to work out. Marriage is not just a sacrament but also a contract, and the contractual aspect is a matter of statute, not scripture"...

http://www.washingtonpost.com/wp-dyn/content/article/2009/05/07/AR2009050703055.html

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Btw. I very much agree with the positions that this journalist made about gay marriage being all about equal rights under the law. I hope that President Obama will take a strong leadership position on this subject sooner rather than later.