Instead of trying to come up and pontificate on what literature is you need to talk with children to teachers and make sure they get poetry in the curriculum early.
Have you ever heard a good joke? If you've ever heard someone just right with the right pacing then you're already on the way to poetry. It's about using words in very precise ways and using gesture.
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There are distinct duties of a poet laureate. I plan a reading series at the Library of Congress and advise the librarian. The rest is how I want to promote poetry.