This is good. He's anticipating the wingnut line of attack and cutting them off at the pass:
WASHINGTON — Chief Justice John G. Roberts was ushered into the Map Room of the White House on Wednesday night to re-administer the oath of office to President Barack Obama because the original oath on Tuesday had a word out of sequence.
White House counsel Greg Craig said the move was made out of "an abundance of caution." Obama's second swearing-in, devoid of the pomp of the initial event, took place at 7:35 p.m. in the presence of a few aides and reporters. The chief justice was wearing a court robe. "Are you ready to take the oath?" Roberts said. "I am," Obama said, "And we're going to do it very slowly."
The retaking of the oath followed two meetings, one with economic advisers and another with the defense secretary, the chairman of the Joint Chiefs of Staff and others to discuss national security and the withdrawal of troops from Iraq.
UPDATE: Spoke too soon! Screaming Drudge headline: 'No bible used at Obama re-swear'. FYI, Matt - the Constitution doesn't require one.