Question: Which appointer of the Joseph Clay (Georgia) is also the  President of the William Carmichael (diplomat) ?
SPARQL:
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Joseph_Clay_(Georgia)> <http://dbpedia.org/ontology/appointer> ?uri. <http://dbpedia.org/resource/William_Carmichael_(diplomat)> <http://dbpedia.org/property/president> ?uri}