SPARQL to find winning parties

sparql.txt

PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX def: <http://data.kasabi.com/dataset/european-election-results/def/>
PREFIX cube: <http://purl.org/linked-data/cube#dataset>

Select ?label
WHERE {
  ?subject rdfs:label ?label ;
    ?p <http://data.kasabi.com/dataset/european-election-results/2009/political_groups/seats_won> .
}