Congress chief Rahul Gandhi and his mother and UPA chairperson Sonia Gandhi are in Chennai after the party's big victory in the Hindi heartland in what is seen as another show of opposition strength. The occasion is the unveiling of a statue of DMK patriarch M Karunanidhi, who died in August after a long illness. The two leaders, who are attending the event after an invitation from Mr Karunanidhi's son MK Stalin, will share stage with him.