"Forty-four Americans have now taken the presidential oath."
That is incorrect. Forty-three Americans have now taken the presidential oath. Grover Cleveland had two non-consecutive terms and is counted as our 22nd and 24th presidents.
But then, do you really expect Obama and/or his speechwriters to be knowlegeable about this piece of trivia when they and countless Americans are ignorant of so many more important facts of our nation's history?