Conservative author Andrew Sullivan has called the rejection of gay marriage among conservatives a “great disappointment.”

The 49-year-old Sullivan, who in 2007 married his husband Aaron Tone in Massachusetts, made his remarks in a CNN interview.

“I think the great disappointment, the great disappointment is that this is a really in some ways conservative argument,” Sullivan told CNN's Fareed Zakaria. “This is a minority group seeking responsibility, commitment, pooling resources. If you're a couple and something happens to one of you, you have someone else to take care of you, not the government. There's a really powerful conservative case for this. And so many of the Republican Party never grappled with it till it was too late.”

Sullivan also credited President George W. Bush's endorsement of a federal marriage amendment for galvanizing support for marriage equality.

“I think that George Bush by endorsing the most unbelievably draconian … to actually write us out of equality in the Constitution itself – just unprecedented attack upon a minority – galvanized everybody around this issue.” (The video is embedded on this page. Visit our video library for more videos.)