Question: Which of the State Louisiana Senators held public office positions status post 1853-12-05?
Answer(s):
answer: Mary Landrieu
answer: Edward Douglass White
answer: Huey Long
answer: John Breaux
answer: Russell B. Long
answer: David Vitter

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.government_positions_held ?c .
?c ns:government.government_position_held.from ?num .
FILTER (?num > "1853-12-05"^^xsd:dateTime) . 
}