Question: What is the alma mater of the senator who is the successor of Warren Magnuson ?
SPARQL:
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Warren_Magnuson> <http://dbpedia.org/property/successor> ?x . ?x <http://dbpedia.org/property/almaMater> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Senator>}