CREATE TABLE table_204_481 (id NUMBER, "poll source" CLOB, "date ( s ) \ administered" CLOB, "sample\ size" NUMBER, "margin of\ error" CLOB, "andrew\ cuomo  ( d ) " CLOB, "rob\ astorino  ( r ) " CLOB, "other" CLOB, "undecided" CLOB)

in which poll source did cuomo earn his top percentage rating ?
SELECT "poll source" FROM table_204_481 ORDER BY "andrew\ncuomo (d)" DESC LIMIT 1
SELECT "poll source" FROM "table_204_481" ORDER BY "andrew\ncuomo (d)" DESC FETCH FIRST 1 ROWS ONLY