SELECT DISTINCT ( MIN( ?lc ) AS ?l ) ( MIN( ?dc ) AS ?d ) ?s
          WHERE { ?pLabel <http://www.w3.org/2000/01/rdf-schema#subPropertyOf>* <http://www.w3.org/2000/01/rdf-schema#label> .
          { ?s ?pLabel ?lc .
          ?lc bif:CONTAINS '''"Barack Obama"''' .
          FILTER ( LCASE( STR( ?lc ) ) = "barack obama"@en || LCASE( STR( ?lc ) ) = "barack obama" ) }
          OPTIONAL { ?s <http://www.w3.org/2000/01/rdf-schema#comment> ?dc .
          FILTER ( LANGMATCHES( LANG( ?dc ), "en" ) ) }
          OPTIONAL { ?s <http://www.w3.org/2000/01/rdf-schema#comment> ?dc . } }
          GROUP BY ?s
          LIMIT 1000