CREATE TABLE table_18368 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" CLOB, "Result" CLOB, "Candidates" CLOB)

What party did the incumbent from the Illinois 1 district belong to?
SELECT "Party" FROM table_18368 WHERE "District" = 'Illinois 1'
SELECT "Party" FROM "table_18368" WHERE "District" = 'Illinois 1'