When my career first began, I didn't have children - so there's a whole lot of difference in the way I choose roles now. Not just films for my children, but how long I'm going to be away, and is Dad going to be home while I'm gone. That sort-of factor plays a part.
The central question is simply put: What did the president know and when did he know it?
No matter how thoroughly a person may have learned the Greek alphabet, he will never be in a condition to repeat it backwards without further training.