CREATE TABLE table_72420 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

In what district was John E. Miller the incumbent?
SELECT "District" FROM table_72420 WHERE "Incumbent" = 'John E. Miller'
SELECT "District" FROM "table_72420" WHERE "Incumbent" = 'John E. Miller'