CREATE TABLE table_18377 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

who were the candidates when the incumbent was ed derwinski?
SELECT "Candidates" FROM table_18377 WHERE "Incumbent" = 'Ed Derwinski'
SELECT "Candidates" FROM "table_18377" WHERE "Incumbent" = 'Ed Derwinski'