CREATE TABLE table_18170 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Results" CLOB, "Candidates" CLOB)

Who's the incumbent of district Wisconsin 5?
SELECT "Incumbent" FROM table_18170 WHERE "District" = 'Wisconsin 5'
SELECT "Incumbent" FROM "table_18170" WHERE "District" = 'Wisconsin 5'