WASHINGTON--President Barack Obama is expected to speak out on gay marriage on Wednesday afternoon in an interview with ABC News Robin Roberts. I'm told the interview was recently booked with the expectation Obama would be asked about gay marriage. The interview at the White House is set for about 3 p.m. est.

My guess: Obama will back allowing civil gay marriage. Government has no control over religious marriage ceremonies, of course.

This comes as gay marriage has been in the news this week-- throwing the Obama team off message. Vice President Joe Biden on NBC's "Meet the Press" on Sunday offered supportive comments about gay marriage and Education Secretary Arne Duncan said Monday he was for it when asked.

Obama at present is against gay marriage. He has been saying for some time he is "evolving" on the issue. White House press secretary Jay Carney cancelled his Wednesday briefing--after questions about gay marriage dominated the Tuesday briefing.