Then why did they call him Tricky Dicky long before he was elected president?
According to an Internet search just now "Tricky Dicky" was something that a political opponent came up with in 1950. After that he was chosen by Eisenhower to be his VP. Kennedy apparently smeared him with the same nick name in 1960 also. This is despite the fact that Kennedy is the one who history shows was the cheater in 1960. And Kennedy didn't get a nick name.