joe biden vice-presidential campaign, 2012 is the running mate for what us presidential campaign?
Entity
m.0gk_h41
Barack Obama presidential campaign, 2012
class entity
government.us_presidential_campaign m.0nbyx6q
government.us_presidential_campaign government.us_vice_presidential_campaign
US Presidential campaign Joe Biden vice-presidential campaign, 2012
none none
government.us_presidential_campaign.running_mate
Running mate
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.us_presidential_campaign . 
VALUES ?x1 { :m.0nbyx6q } 
?x0 :government.us_presidential_campaign.running_mate ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND government.us_presidential_campaign (JOIN government.us_presidential_campaign.running_mate m.0nbyx6q))