election polls released no earlier than 08/18/2012 have what polling authority?
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class class literal
government.polling_authority government.election_poll 2012-08-18^^http://www.w3.org/2001/XMLSchema#date
government.polling_authority government.election_poll type.datetime
Polling authority Election poll 08/18/2012
none none >=
government.polling_authority.polls government.election_poll.release_date
Election polls Release date
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX : <http://rdf.freebase.com/ns/> 
SELECT (?x0 AS ?value) WHERE {
SELECT DISTINCT ?x0  WHERE { 
?x0 :type.object.type :government.polling_authority . 
?x1 :type.object.type :government.election_poll . 
FILTER (?x2 >= "2012-08-18-08:00"^^<http://www.w3.org/2001/XMLSchema#date>)
?x0 :government.polling_authority.polls ?x1 . 
?x1 :government.election_poll.release_date ?x2 . 
FILTER ( ?x0 != ?x1 && ?x0 != ?x2 && ?x1 != ?x2  )
}
}
(AND government.polling_authority (JOIN government.polling_authority.polls (ge government.election_poll.release_date 2012-08-18^^http://www.w3.org/2001/XMLSchema#date)))