CREATE TABLE table_18576 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

What is the party for new york 20?
SELECT "Party" FROM table_18576 WHERE "District" = 'New York 20'
SELECT "Party" FROM "table_18576" WHERE "District" = 'New York 20'