Question: Under which president did some politicians live in Kensington?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/residence> <http://dbpedia.org/resource/Kensington,_Maryland> . ?x <http://dbpedia.org/ontology/president> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/OfficeHolder>}