CHENNAI: Even as he was fighting to quell rumours on his father’s health, DMK working president MK Stalin on Friday tweeted to hail the party chief M Karunanidhi as he entered 50th year as head of DMK, a rare feat in Indian politics. “He has weathered many a flash floods, uncountable acts of treachery, insurmountable crises, (put up) astonishing victories and (suffered) crushing defeats that pushed into the deep bottom. He has registered unmatchable achievements. We shall move forward on his path,” Stalin hailed in his tweet.