SCHEMA:
CREATE TABLE table_2668401_12 (incumbent VARCHAR, candidates VARCHAR)
USER:
Name the incumbent for candidates Joseph Hiester (dr) 83.2% Roswell Wells (f) 16.8%.

QUERY:
SELECT incumbent FROM table_2668401_12 WHERE candidates = "Joseph Hiester (DR) 83.2% Roswell Wells (F) 16.8%"