CREATE TABLE table_6559 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB)

Which First elected has a District of illinois 3?
SELECT MAX("First elected") FROM table_6559 WHERE "District" = 'illinois 3'
SELECT MAX("First elected") FROM "table_6559" WHERE "District" = 'illinois 3'