WASHINGTON-US President Barack Obama again took oath of office a second time on Wednesday at the White House because a word was out of sequence when he was sworn in Tuesday. His oath-taking was administered by Chief Justice John Roberts in front of the reporters. The oath was administered a second time out of an 'abundance of caution', White House Counsel Greg Craig said in a statement. 'We believe that the oath of office was administered effectively and that the President was sworn in appropriately on Tuesday', he said. 'But the oath appears in the Constitution itself. And out of an abundance of caution, because there was one word out of sequence so Chief Justice Roberts administered the oath a second time', Craig added. At his inauguration ceremony , Obama stumbled because the Chief Justice used the word 'faithfully' out of sequence-as he swore to execute the office of the President.