He also doesn’t know that there are 50 states in these United States
It's all explain-away-able. He's just lucky he isn't a Republican Vice Presidential candidate, as Dan Quayle was, or the DBMs would've mercilessly crucified him a dozen times over by now.
Barack was just momentarily confused by the similarly well-known fact (also near the tip of his thinking and from his early schooling) that there are 57 Islamic states. They teach that in Quranic-oriented madrassas all the time.
HF