It's not just a battle over a word. The word is more than just short-hand.
It wasn't that long ago that mixed-race marriages were illegal in many parts of the US. While analogies are always imperfect, making an analogy to that from the present situation is instructive, I think.
Why couldn't there have just been a Civil Union for Obama's parents? Traditionally, many people believed that the races shouldn't mix. Why not just call a mixed-race union a Civil Union since so many people were upset about mixed-race marriages?
Why not? Because "equal protection" is a vitally important concept. It must not be subordinated to religious doctrines. We tried "separate but equal" - it doesn't work and it's not good enough.
Many of those who are most vociferous in their opposition to gay marriage are intent upon restricting the rights of others based on a world-view that is ultimately grounded in their religion and in their ignorance and fear of those who are different. Their fear of gay marriage has the same root as their fear of gay teachers or gay soldiers or ...
As the Iowa court pointed out in their ruling in Varnum v Brien - http://www.iowacourt...arnum/07-1499.pdf - , unless there's a compelling state interest for an exception, then the law must apply equally to adults. The child-rearing argument holds no water, as the court pointed out. Neither do the other usual arguments against gay marriage.
Nobody is forcing a church to perform a marriage ceremony for anyone.
Civil Union laws aren't good enough. Gay Marriage needs to be permitted.
My $0.02.
Cheers,
Scott.