Read the clues, and try to figure out what they refer to.  Be sure to think carefully.  The first answer may or may not be right.

Clues:
1. Arnold Schwarzenegger has a big one.
2. Bill Gates has a small one.
3. Madonna doesn't have one.
4. The Pope has one, but never uses it.
5. Bill Clinton has one, and uses it a lot.

What is it?
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The answer is "last name".  What did you think it was?