Ross Douthat in the New York Times says if same-sex proponents and journalists were consistent, they would be far more harsh on the President's waffling on marriage:

"...to say that the president’s approach is understandable does not mean that it’s necessarily defensible. Supporters of same-sex marriage have worked very hard to frame their issue, not as an ordinary political conflict, but as an all-or-nothing question that pits enlightenment and progress against reaction, bigotry and hate. I don’t accept that framing, but I accept that its architects genuinely believe in it, and see the conflict over same-sex unions as a clear-cut struggle between good and evil, with no possibility of middle ground.

...[but] if you accept the framing of the debate that many liberals (and many journalists) embrace, then you have to acknowledge that President Obama has spent the last four years lying to the American people about his convictions on one of the defining civil rights issues of our time, and giving aid and comfort to pure bigotry in the service of his other political priorities."