CREATE TABLE table_25282 ("Constituency" TEXT, "Winner" TEXT, "Party" TEXT, "Margin" FLOAT, "Runner-up a" TEXT, "Party a" TEXT)

What is every party with a winner of P. Chidambaram?
SELECT "Party a" FROM table_25282 WHERE "Winner" = 'P. Chidambaram'
SELECT "Party a" FROM "table_25282" WHERE "Winner" = 'P. Chidambaram'