CREATE TABLE table_18366 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" TEXT, "Result" TEXT, "Candidates" TEXT)

Who was the democratic incumbent in the Illinois 11 district who was re-elected?
SELECT "Incumbent" FROM table_18366 WHERE "Party" = 'Democratic' AND "Result" = 'Re-elected' AND "District" = 'Illinois 11'
SELECT "Incumbent" FROM "table_18366" WHERE "District" = 'Illinois 11' AND "Party" = 'Democratic' AND "Result" = 'Re-elected'