I too have defended Pastor Warren....mostly regarding words attributed to him that he did not say. Having reviewed the video of him on LKL the most important word left out in his reply was the word ACTIVIST. He did not say he was for gay marriage, only that in opposing gay marriage he was not an ACTIVIST. We all have our own ideas/opinions of the present definition of ACTIVIST.
The part that bothered me was his saying that he did not endorse prop. 8. He did in his church, but I do not know if he went public: tv, newspaper ad, radio, or billboard with an endorsement.
I have too. I have thought that some critics of Purpose-Driven Church and Purpose-Driven Life were off-base. I don't endorse those books but they are not as bad as their critics suggest.
There is absolutely NO reason for a Christian to apologize for opposing gay marriage.