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Fensterbilt, are you serious? YOUR butt is a metaphor. Mine is a simile. My nostrils are synecdoche and my liver is an analogy.
What the heck are you talking about? Leave Mrs. Obama alone. She is a brilliant, strong, talented woman and a person in her own right. Her body parts aren't "metaphors".
Talk about her accomplishments or perhaps how her being the first African-American first lady is a symbolic or meaningful event. Stay off the personhood of the first family.