In the second such instance in a week, Opposition DMDK replaced one of its candidates for the April 24 Lok Sabha polls.
DMDK founder Vijayakanth replaced his party's candidate for Cuddalore Lok Sabha seat, fielding C R Jaishankar in place of R Ramanujam.
Announcing the change in a statement, Vijayakanth, however, did not specify any reason for his decision, but appealed to his local functionaries to ensure the victory of Jaishankar.
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Vijayakanth later named S K Vel for Namakkal.
DMDK is facing the polls as part of the BJP-led combine in Tamil Nadu and has been allotted 14 seats by the saffron party. The state has a total of 39 constituencies.