Would Obama have been fine with saying his parents entered into a civil partnership? Maybe. But would he be fine with hearing that his parents' marriage was akin to a brother marrying his sister or a pedophile marrying a child?
Obama's choice of Rick Warren to give the invocation at his inauguration is dreadful. His explanation is even worse. He shrinks Warren's statements about gay people down to a "disagreement," as if we're talking about ethanol subsidies.
The Rick Warrens of the world pretend that the Bible says marriage is between a man and a woman. But the Bible is full of men taking on second wives, prostitutes and concubines. And all the while, God heartily approves.