Radhakrishnan has served as a Minister of Tamil Nadu and Member of the Tamil Nadu Legislative Assembly elected from Tiruchendur constituency as AIADMK candidate in 2001, 2006 and as DMK candidate in 2009 (By-election), 2011, 2016 and 2021. He was also former Minister for Animal Husbandry and Minister for Housing & Urban Development in the 2001 AIADMK government.[1][2][3]
He was a member of the Anna Dravida Munnetra Kazhagam party in Tamil Nadu until being expelled for alleged anti-party activities on 30 July 2009 and resigned from his MLA Post after being expelled from AIADMK. After his expulsion from the AIADMK, Radhakrishnan accepted an invitation to join the Dravida Munnetra Kazhagam in 2009.[4]
In the 2009 By-election, he again contested as a DMK Candidate and won in the Tiruchendur constituency.
Even though there was an anti-incumbency wave against the DMK, he won the 2011 Assembly election in Tiruchendur constituency.[5]
In the 2021 assembly election, he again won from Tiruchendur constituency and he was appointed Minister for Fisheries โ Fishermen Welfare and Animal Husbandry.[7][8]