CREATE TABLE table_2703 ("Constituency" CLOB, "Winner" CLOB, "Party" CLOB, "Margin" FLOAT, "Runner-up a" CLOB, "Party a" CLOB)

Who was the runner up for the Nagapattinam constituency?
SELECT "Runner-up a" FROM table_2703 WHERE "Constituency" = 'Nagapattinam'
SELECT "Runner-up a" FROM "table_2703" WHERE "Constituency" = 'Nagapattinam'