I agree with CWood. Obama is saying he's going to use the Lincoln Bible to draw attention to the fact that it's a Bible and not a Koran. He compensating because he knows that he's a Muslim at heart and he's scared that someone will find out. I wouldn't be surprised if he's planning on having a secret, private inauguration with a Koran before and then praying forgiveness for swearing on the Bible at the public inauguration.