Here's the oath, from the Constitution:
Before he enter on the Execution of his Office, he shall take the following Oath or Affirmation:
"I do solemnly swear (or affirm) that I will faithfully execute the Office of President of the United States, and will to the best of my Ability, preserve, protect and defend the Constitution of the United States."
Note that the Chief Justice added "So help me God." with a question in his tone, and Obama added it in an affirmation. He could have added "YES WE CAN!" instead if he wanted, but he could have said anything, and I think he wants God's help. I'm sure he can use it. They say God helps those who help themselves.
Maybe Obama should have been Chief Justice. It would be nice if he could appoint the next Chief Justice, but only time will tell.
Here's to the first Professor President since Woodrow Wilson! I'm glad he knows the Constitution as well as he does.
Here's to the next four years of America in the world! Here's to President Barack Hussein Obama and his inauguration.