CREATE TABLE table_18374 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

what was the year first elected for district illinois 7?
SELECT MAX("First elected") FROM table_18374 WHERE "District" = 'Illinois 7'
SELECT MAX("First elected") FROM "table_18374" WHERE "District" = 'Illinois 7'