Thiruvarur is a high-profile constituency, having been the home seat of former Chief Minister M. Karunanidhi. It remains a bastion for the DMK. In the 2021 Assembly elections, DMK’s Poondi K. Kalaivanan won the seat with 1,08,906 votes, defeating AIADMK’s A. N. R. Paneerselvam, who secured 57,732 votes. The margin of victory was a massive 51,174 votes. In the 2016 Assembly elections, DMK leader M. Karunanidhi won the seat with 1,21,473 votes, defeating AIADMK’s A. N. R. Paneerselvam, who received 53,107 votes. The margin of victory was 68,366 votes. In the 2011 Assembly elections, DMK’s M. Karunanidhi won the seat with 1,09,011 votes, defeating AIADMK’s M. Rajendran, who secured 58,762 votes. The margin of victory stood at 50,249 votes.