He might have been also counting US possessions also. And it's an accepted fact that there was 44 Administrations, as there was a break between Grover Cleveland's terms of office. I think this is too petty to nit-pick about speaking mistakes. At least he is including all types of people, unlike the elephants (Republicans)
If you look at Economic History, most of the time prosperity was when a Democrat was in office, and recessions, etc. were when a Republican was in office. Remember, if you want stuff (services, etc.) you gotta pay! So, if you get a tax cut, don't cry when services are cut back. That's my 2 cents. If you got to this point,Thanks for listening!!