John Roberts wasn't the only one who made an error on Inauguration Day. In President Obama's Inaugural Address he stated that he was the 44th person to take the oath of office. In reality he is only the 43rd. President Grover Cleveland, the only President ever elected to two non-consecutive terms in office, is counted as both the 22nd and 24th President. Hence, Obama is only the 43rd man to take the oath.