In 2006, Rick Warren publicly lionized (literally) Peter Akinola three months after the Archbishop had endorsed legislation more draconian than comparable anti-gay statutes passed prior to World War II under the Third Reich.
Obama can call the placing of a hate monger like Rick Warren on the world dais political healing or inclusiveness or any other nicety he'd like, but I call it pandering to the lowest instinct of the worst kind of politics.
The gay marriage issue has intruded so profoundly on gay politics that I am told I should protest the inauguration of Obama, because he invited a minister to say a prayer whose main priorities are climate change, poverty, and AIDS.
If there is a rational argument against gay marriage, I have yet to see it. And this is why Obama's invitation to Warren might just work. A major limitation to progressive thinking is our over-reliance on rational debate.
I am willing to agree that Rev. Warren is a good guy who said some bad things. I, like you, do trust that communication and cooperation will lead to increased tolerance and progress. I can't forgive Obama, though.