Question: Who is the Louisiana State Senator and politician who has had tenure since 04-14-1842?
Answer(s):
answer: Charles Magill Conrad

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.04ly1)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.04ly1 ns:government.political_district.representatives ?y .
?y ns:government.government_position_held.office_holder ?x .
?y ns:government.government_position_held.office_position_or_title ns:m.02_7l8y .
?x ns:government.politician.party ?c .
?c ns:government.political_party_tenure.from "1842-04-14"^^xsd:dateTime . 
}