Question: What political offices has the person who said "Yes we can!" held?
Answer(s):
answer: United States Senator
answer: Illinois State Senator

SPARQL query:
#MANUAL SPARQL
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
  FILTER (?x != ?c)
?c ns:people.person.quotations ns:m.04s_lpn . 
?c ns:government.politician.government_positions_held ?y .
  ?y ns:government.government_position_held.office_position_or_title ?x ;
     ns:government.government_position_held.to ?d .  # the position has ended; not the current position
}