You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: 18th CENTURY AUTHORS 
Clue: In a poem he named himself Cadenus, an anagram of Decanus, or "Dean"
jonathan swift

Category: U.S. HISTORY 
Clue: The day affer the 15th Amendment took effect, Thomas Peterson became the 1st Afr. American to do this under its provisions
vote

Category: THE 9 MUSES 
Clue: In a Balanchine ballet, Apollo, god of music, has a favorite muse, this one

terpsichore