To be fair, TOTUS has to keep track of which name he's using, from a long list of aliases: Comrade Chairman Senator Community-Organizer-in-Chief Barack Barry Hussein Soetoro Dunham Obama TOTUS POTUS TWAP. I don't think anyone alive can keep track of his various histories, except perhaps Bill Ayers, who wrote the various revisions of Obama's immaculate deception.
Yes, it must be difficult remembering whom he is claiming to be at any particular time.