President Barack Obama said he could not imagine a circumstance in which a state banning gay marriage was legal, wading into an issue he initially said should be left to the states. ABC News' George Stephanopoulos asked Obama in an interview released Wednesday whether gay marriage was a right under the Constitution. "Well, I’ve gotta tell you that -- in terms of practical politics, what I’ve seen is a healthy debate taking place state by state, and not every state has the exact same attitudes and cultural mores. And I -- you know, my thinking was that this is traditionally a state issue and -- that it will work itself out," he said. "On the other hand -- what I also believe is that the core principle that people don’t get discriminated against -- that’s one of our core values. And it’s in our Constitution."