which is the polling authority for election polls released no earlier than 09/22/2012?
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 Christian Science Publishing Society Investor's Business Daily Zogby International Gallup ABC News The Washington Post Associated Press GfK Winston Group (R) YouGov Pew Research Center Politico George Washington University Greenberg Quinlan Rosner Monmouth University CVOTER International RAND Fox News Channel Democracy Corps CNN Quinnipiac University NPR CBS News The New York Times
class class literal
government.polling_authority government.election_poll 2012-09-22^^http://www.w3.org/2001/XMLSchema#date
government.polling_authority government.election_poll type.datetime
Polling authority Election poll 09/22/2012
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 >= "2012-09-22-08:00"^^<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 2012-09-22^^http://www.w3.org/2001/XMLSchema#date)))