Question: What winner of the 2007 Nobel Peace Prize began his governmental job earliest?
Answer(s):
answer: Al Gore

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.05f3q)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.05f3q ns:award.award_category.winners ?y .
?y ns:award.award_honor.award_winner ?x .
FILTER(NOT EXISTS {?y ns:award.award_honor.year ?sk0} || 
EXISTS {?y ns:award.award_honor.year ?sk1 . 
FILTER(xsd:datetime(?sk1) >= "2007-01-01"^^xsd:dateTime) })
FILTER(NOT EXISTS {?y ns:award.award_honor.year ?sk2} || 
EXISTS {?y ns:award.award_honor.year ?sk3 . 
FILTER(xsd:datetime(?sk3) <= "2007-12-31"^^xsd:dateTime) })
?x ns:government.politician.government_positions_held ?c .
?c ns:government.government_position_held.from ?num .
}
ORDER BY ?num LIMIT 1