The late DMK patriarch M Karunanidhi had also been in total support ofstatehood for Puducherry, he said at a public meeting organised here by the Secular Progressive Alliance.
Stalin was canvassing votes for former Puducherry Assembly Speaker and Congress nominee for the lone Lok Sabha seat in the union territory V Vaithilingam and DMK candidate K Venkatesan for the Thattanchavady Assembly by-poll.
"The DMK has always supported Puducherry's full statehood demand. We will never let down Puducherry at any cost," he said.
He recalled that protests had broken out when an attempt was made in 1979 by the then Prime Minister Morarji Desai and then Tamil Nadu Chief Minister M G Ramachandran to dismantle the separate status of Puducherry and merge it with the neighbouring state.
He alleged the promises made by the BJP during the run-up to the 2014 Lok Sabha elections had not not been fulfilled.
"All the promises and assurances are only on paper and nothing had been done to realise them," he said.
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