Obama was responding to the comments Rev. Wright made yesterday, not earlier ones. He didn't just out of the blue decide to backtrack on what happened before. If you read what Obama said, I think it sounds reasonable.
http://www.cnn.com/2008/POLITICS/04/29/obama.wright/index.htmlThe whole thing was a manufactured issue to begin with, the Clintons trying to tar Obama with guilt by association. I'm not sure what more they can try at this point. But they'll probably come up with something.