ERODE | TIRUPUR: The MDMK led by Vaiko, on Saturday, in rearticulating its political responsibility, declared that it would be part of a DMK-led alliance in Tamil Nadu to defeat the BJP-led NDA at the Centre and the AIADMK in the State in the coming elections. The state-level MDMK conference at Moolakarai, which began here on Saturday, to celebrate the …