The bypoll, necessitated following the death of former Speaker and Congress leader G Karthikeyan, is a crucial test for both the Fronts as the Assembly poll is only an year away.
A total of 152 polling booths have been set up in the constituency. Security personnel, including those from BSF, are posted at some sensitive booths to ensure smooth conduct of polling.
EVMs, being used in the polls, have photographs of the candidates affixed against their names.
UDF is banking on the "various welfare and development initiatives" of the four-year-old government while LDF and BJP attack the government on the solar and bar bribe scams and alleged corruptions in the PWD ministry.
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For UDF, which came to power with a wafer thin majority of two MLA's in 2011 and is riding on the slogan of "development and care", the result is widely considered as a referendum on the performance of the government.
LDF which is eyeing to capture the seat from Congress has fielded 66-year-old former assembly Speaker and minister M Vijayakumar (CPI-M) as its candidate.