"I was already engaged in the campaign but the official clearance of my name has just now come from the AICC. There is no doubt of the outcome and I will win comfortably," said the 65-year-old Vijayakumar.
Although the Election Commission is yet to give any indication of the by-poll, the three rival fronts have started zeroing down on their nominees.
The CPI-M is likely to field Alappuzha district Secretary Saji Cherian, who has twice contested unsuccessfully in the past.
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