The DMK President and Tamil Nadu Chief Minister, Mr. M. Karunanidhi has said that seat sharing talks with the Congress for the ensuing elections in Tamil Nadu will commence after the Pongal festival.Mr. Karunanidhi was, talking to newsmen after chairing a meeting of the party MLAs in Chennai this evening. He said the UPA Chairperson, Mrs. Sonia Gandhi had echoed the opinion of the Prime Minister, Dr. Manmohan Singh that the alliance between the DMK and Congress was strong.