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: 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: ARTISTS
Clue: As of Oct. 1999, of the 10 most expensive paintings sold at public auction, these 2 artists had 4 each on the list
pablo picasso & vincent van gogh

Category: U.S. PRESIDENTS
Clue: With a book about the south, he became the first president--past or present--to publish a novel
jimmy carter