Question: Which incumbent of Al Gore presidential campaign wass also the president of Mike McCurry ?
SPARQL query:
PREFIX onto: <http://dbpedia.org/ontology/>
 SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Mike_McCurry_(press_secretary)> onto:president ?uri. <http://dbpedia.org/resource/Al_Gore_presidential_campaign,_2000> onto:incumbent ?uri}