Question: Where is the senator from whose successor was James belford?
SPARQL query: SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/successor> <http://dbpedia.org/resource/James_B._Belford> . ?x <http://dbpedia.org/ontology/region> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Senator>}
Answer: The regions of the senator whose successor is James B. Belford are [Colorado, Colorado's at-large congressional district].