CREATE TABLE table_203_615 (id DECIMAL, "district" TEXT, "incumbent" TEXT, "party" TEXT, "first\ elected" DECIMAL, "result" TEXT, "candidates" TEXT)

what is the number of democratic gains listed ?
SELECT COUNT(*) FROM table_203_615 WHERE "result" = 'democratic gain'
SELECT COUNT(*) FROM "table_203_615" WHERE "result" = 'democratic gain'