Huge number of supporters have congregated outside the hospital where Karunanidhi is admitted for treatment.
Karunanidhi, chief of the Dravida Munnetra Kazhagam (DMK) party in southern Tamil Nadu state, was admitted into hospital on July 28 after a drop in his blood pressure. Earlier the Doctors had said that the 94-year-old former Tamil Nadu Chief Minister's response to medical intervention over the next 24 hours would determine the prognosis.
He also made enormous contributions to Tamil literature and cinema.
At the age of 14, M Karunanidhi entered politics.
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Mr Karunanidhi was among the proponents of the Dravidian movement, which defines Tamil Nadu politics and espouses rationalism, atheism and challenged the dominance of the upper caste Brahmins. He won his first Assembly seat from Kulithalai, in Trichy, in 1957 and became a minister of public works in 1967, when Annadurai was chief minister. The greatest achievement of his politician genius was how he melded tough regionalism with unequivocal nationalism. To his credit, Karunanidhi kept the party intact for the 13 long years in the Opposition fighting against a charismatic leader like MGR.
Prime Minister Narendra Modi has led tributes to the veteran leader. Karunanidhi is considered as the leader who has always been concerned about his party and its people. Karunanidhi's close friend MG Ramachandran's enormous resources helped to tilt the race to chief minister's chair in his favour while DMK seniors like VR Nedunchezhian were forced to give way.
When Mr Annadurai died in 1969, Mr Karunanidhi, then in his 40s, took over leadership of the DMK. He blamed the raid on his opponent Jayalalithaa who also faced allegations of graft and was found guilty of corruption after her death. One Dravida party, AIADMK, is already weakened by succession trouble. Kanimozhi who Karunanidhi declared as his literary heir is a second term Rajya Sabha MP and DMK's women wing secretary. His son M.K Stalin is the party chief now.