How come Sarah Silverman gets to use the 'n' word, but not Dr. Laura?

Is it because she is cute and has a dirty mouth (yum!)?

Aren't they both Jewish women? Sarah a young cute one and Dr. Laura a old and daily shriveling one?
Update: JAMAL, I know! I would totally hit that.
Update 2: majnun, Michael Richards is a Jewish comedian as well, but kind of old too. And a guy.
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