CREATE TABLE table_2668401_12 (incumbent VARCHAR2, candidates VARCHAR2)

Name the incumbent for candidates Joseph Hiester (dr) 83.2% Roswell Wells (f) 16.8%.
SELECT incumbent FROM table_2668401_12 WHERE candidates = "Joseph Hiester (DR) 83.2% Roswell Wells (F) 16.8%"
SELECT "incumbent" FROM "table_2668401_12" WHERE "Joseph Hiester (DR) 83.2% Roswell Wells (F) 16.8%" = "candidates"