Polling has begun for bye-elections to five Assembly constituencies in Tamil Nadu, Puducherry and West Bengal, and one Lok Sabha seat in Assam. Voting is taking place for Madurantakam and Dharapuram assembly seats in Tamil Nadu, Thattanchavady in Puducherry, and Rejinagar and Nandigram in West Bengal. The lone Lok Sabha seat where voting is taking place is Nagaon in Assam. The counting of votes will be taken up on Friday.