Simplify the following text for a Grade 5 native English-speaking person.
Original: The single notable exception among modern presidents is John F. Kennedy , with whom Graham played golf , but Kennedy was Roman Catholic ; Graham enjoyed a friendship with Nixon and prominently supported him over Kennedy in the 1960 presidential election .
Simplified: The only president he did not know very well was John F. Kennedy . Graham did golf with him , but Kennedy was a Roman Catholic .