what is the name of the polling authority for election polls released no earlier than 05/09/2012?
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 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 Yahoo Esquire Christian Science Publishing Society Investor's Business Daily Douglas Schoen YouGov Zogby International Associated Press GfK Pew Research Center Tarrance Group (R) ABC News The Washington Post Mason-Dixon Polling & Research Inc. Winston Group (R) Monmouth University Greenberg Quinlan Rosner Politico George Washington University CVOTER International RAND CVOTER International American Research Group Fox News Channel UConn Marist College CBS News The New York Times Reason Foundation FTI Consulting Democracy Corps CNN North Star Opinion Research (R) Quinnipiac University NPR Public Religion Research Institute
class class literal
government.polling_authority government.election_poll 2012-05-09^^http://www.w3.org/2001/XMLSchema#date
government.polling_authority government.election_poll type.datetime
Polling authority Election poll 05/09/2012
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 >= "2012-05-09-08:00"^^<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 2012-05-09^^http://www.w3.org/2001/XMLSchema#date)))