Question: Who was the president at the time when both Carl Stokes and Joseph Stiglitz held a position in US political framework?
SPARQL query:
PREFIX res: <http://dbpedia.org/resource/>
PREFIX prop: <http://dbpedia.org/property/>
SELECT DISTINCT ?uri WHERE { res:Carl_Stokes prop:president ?uri. res:Joseph_Stiglitz prop:president ?uri . }