Which electoral district elected in John F. Kennedy has position held as United States senator?
SELECT ?value1 ?value2 WHERE { wd:Q9696 p:P39 ?s . ?s ps:P39 wd:Q13217683 . ?s pq:P768 ?value1 . ?s pq:P2715 ?value2 }
john f. kennedy: Q9696 : Q13217683