CREATE TABLE table_18662 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

what's the district with incumbent being william j. driver
SELECT "District" FROM table_18662 WHERE "Incumbent" = 'William J. Driver'
SELECT "District" FROM "table_18662" WHERE "Incumbent" = 'William J. Driver'