Question: Which president had lieutenants whose governor was Bill Clinton?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/governor> <http://dbpedia.org/resource/Bill_Clinton> . ?uri <http://dbpedia.org/ontology/lieutenant> ?x  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/President>}