CREATE TABLE table_18393 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" CLOB, "Result" CLOB, "Candidates" CLOB)

Who's the incumbent of Indiana 4 district?
SELECT "Incumbent" FROM table_18393 WHERE "District" = 'Indiana 4'
SELECT "Incumbent" FROM "table_18393" WHERE "District" = 'Indiana 4'