CREATE TABLE table_18704 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

who is the incumbent for district mississippi 4
SELECT "Incumbent" FROM table_18704 WHERE "District" = 'Mississippi 4'
SELECT "Incumbent" FROM "table_18704" WHERE "District" = 'Mississippi 4'