CREATE TABLE table_203_409 (id DECIMAL, "rank" DECIMAL, "representative" TEXT, "party" TEXT, "district" TEXT, "seniority date" TEXT, "notes" TEXT)

does each congressman have a party listed ?
SELECT COUNT(*) = 0 FROM table_203_409 WHERE "party" IS NULL
SELECT COUNT(*) = 0 FROM "table_203_409" WHERE "party" IS NULL