Question: There might have been?
There was nothing to question.

Answer: no

Question: He's such a dear little man!
The person is a child.

Answer: it is not possible to tell

Question: On The Simpsons , for example, Nixon has appeared in caricature at least 20 times (according to the Simpsons Archive Web site).
Nixon has made multiple appearances on The Simpsons.

Answer:
yes