Who appointed both John Drayton and William Clark to their respective offices?
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/John_Drayton> <http://dbpedia.org/property/appointer> ?uri. <http://dbpedia.org/resource/William_Clark> <http://dbpedia.org/property/appointer> ?uri . }
John_Drayton William_Clark