President Obama wrongly stated that he was the 44th person to be sworn into this office. This is technically incorrect, Grover Cleveland was both the 22nd and 24th President. Accordingly, Obama is the the 43rd person to be sworn into office.
Anyway, the whole thing was very touching. Regardless of what you think about American Politics, it is truly remarkable that the most powerful country in the world can have such a peaceful transition of power.