CREATE TABLE table_18605 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

Which political party is involved where John J. Delaney is the sitting Representative?
SELECT "Party" FROM table_18605 WHERE "Incumbent" = 'John J. Delaney'
SELECT "Party" FROM "table_18605" WHERE "Incumbent" = 'John J. Delaney'