BJP's nominee Ms Lalitha Kumaramangalam has said it would be security, women and public health if she was elected, while DMK's Dr Ramadoss said the upliftment of backward community would be his main concern.
In an event rarely seen during elections, rival candidates shared a common platform to make promises.
The candidates of BJP, PMK and candidates of other parties highlighted their priorities before the media.
The AIADMK-backed BJP nominee Lalitha Kumaramangalam said if she was elected she would strive to ensure security to the people, their property, improvement in public health and specific programmes for women among other things.
M Ramadoss of the PMK, an ally of the DMK-led Democratic Progressive Alliance, said he would strive to get more power for the government, uplift of backward communities and the like.
Others who participated in the programme included S Balasubramanian (CPI(M) and Sundaramoorthy (RLD).