Question: To what party belonged the author of the "London to Ladysmith via Pretoria in politics"?
Answer(s):
answer: Liberal Party
answer: Conservative Party

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:book.author.book_editions_published ns:m.04v4_1t . 
?c ns:government.politician.party ?y .
?y ns:government.political_party_tenure.party ?x .
}