Question: What party affiliation is the architect who was known for designing "Poplar forest" known for be a part of?
Answer(s):
answer: Democratic-Republican 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:architecture.architect.structures_designed ns:m.02kpf3 . 
?c ns:government.politician.party ?y .
?y ns:government.political_party_tenure.party ?x .
}