Question: What person who served in the political party, Social Democratic Federation, influenced Frank Lloyd Wright?
Answer(s):
answer: William Morris

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.02wlk)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.02wlk ns:influence.influence_node.influenced_by ?x .
?x ns:government.politician.party ?c .
?c ns:government.political_party_tenure.party ns:m.01py45 . 
}