Kathik Thondaiman of the AIADMK and DMDK's Jahir Hussain are in the fray among 18 others even as other opposition parties, DMK and Marumalarchi Dravida Munnetra Kazhagam which had fought the earlier Sankarankoil by-poll, have not fielded their candidates.
Outsiders have been asked to leave the constituency and the Election Commission has banned exit polls from 8 am to 5 pm on the polling day.
The state government has declared a holiday for the constituency to facilitate the polling process.
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