Is President Barack Obama preparing to endorse gay marriage during Tuesday's State of the Union address? The White House will not rule out the possibility.

Obama has said he supports civil unions for gay and lesbian couples. But in 2010 he opened the door to marriage, saying he was “evolving” on the issue. Since then, each time the president attends a gay fundraiser or event, speculation that he'll move on the issue resurfaces.

When CNN's Dan Lothian asked White House Press Secretary Jay Carney about Obama's status on the issue, Carney said he doesn't “have an update,” then reminded reporters of the president's record on gay rights.

“I think it is important as part of my answer here to just remind you about the president's record on these issue,” Carney said on Friday. “Ending 'Don't Ask, Don't Tell,' and on marriage in particular, having the federal government stand down from, or his administration stand down from defending DOMA, believing that it's unconstitutional and working to have it repealed.”

Gay weekly the Washington Blade's Chris Johnson followed up with: “I know you said you don't want to talk specifics about the State of the Union address, but I was just wondering if you could rule out the possibility of the president completing his evolution and endorsing marriage equality next week?”

“Again, I will not rule anything in or out,” Carney answered. “I'm just not going to talk about – beyond pointing at his words – his personal views on this. I think his administration's policies on related issues are there for people to judge.” (The video is embedded in the right panel of this page. Visit our video library for more videos.)