List the alma mater of the congressmen who attended Nashville, Tennessee ?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/almaMater> <http://dbpedia.org/resource/Nashville,_Tennessee> . ?x <http://dbpedia.org/ontology/almaMater> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Congressman>}
Nashville,_Tennessee