CREATE TABLE table_22754310_1 (margin NUMBER, party VARCHAR2, winner VARCHAR2)

Name the most margin for nco party and p. ramachandran won
SELECT MAX(margin) FROM table_22754310_1 WHERE party = "NCO" AND winner = "P. Ramachandran"
SELECT MAX("margin") FROM "table_22754310_1" WHERE "NCO" = "party" AND "P. Ramachandran" = "winner"