Slacktivist is always a good read, but this is a particularly good post on Obama's dropping of the DOMA defense, and the issue in general:
http://slacktivist.typepad.com/slacktivist/2011/02/cricket-cricket-tumbleweed.html He just made another post on the same issue which looks good as well.
"What's driving all of this is the conception that this is how democracy works -- that if the Christian majority does not impose its hegemonic sway over others, then those others may arise to impose their sectarian sway over Christians. They don't believe in religious freedom per se. I don't mean that they're opposed to it, but that they don't even understand the idea. They don't seem to realize even that it is an option.
When you think of democracy as whatever the majority wants -- unlimited by any guarantee or protection of the rights of minorities -- then you are in a fight to impose your will over that of others."