Question: Who was the Vice President of the man about whom "Gore Vidal's Lincoln" was written?
Answer(s):
answer: Andrew Johnson

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ?c)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
?c ns:film.film_subject.films ns:m.04j21rb . 
?c ns:government.us_president.vice_president ?x .
?x ns:government.us_vice_president.vice_president_number ?sk0 .
}
ORDER BY DESC(xsd:float(?sk0))
LIMIT 1