election polls released no earlier than 2012-09-16 have what polling authority?
Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity
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Rasmussen Reports Ipsos Reuters NBC News The Wall Street Journal Bloomberg L.P. Public Policy Polling Gallup Christian Science Publishing Society Investor's Business Daily Zogby International ABC News The Washington Post Associated Press GfK Winston Group (R) Pew Research Center YouGov Monmouth University Politico George Washington University Greenberg Quinlan Rosner CVOTER International RAND CVOTER International Fox News Channel UConn Reason Foundation FTI Consulting Democracy Corps CNN Quinnipiac University NPR CBS News The New York Times
class class literal
government.polling_authority government.election_poll 2012-09-16^^http://www.w3.org/2001/XMLSchema#date
government.polling_authority government.election_poll type.datetime
Polling authority Election poll 2012-09-16
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 >= "2012-09-16-08:00"^^<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 2012-09-16^^http://www.w3.org/2001/XMLSchema#date)))