The Dravida Munnetra Kazhagam and the Amma Makkal Munnetra Kazhagam on Friday announced their candidates, Poondi K. Kalaivanan and S. Kamaraj, respectively, for the Tiruvarur Assembly constituency where a byelection is slated to be held on January 28. Mr. Kalaivanan, the DMK’s Tiruvarur district secretary, is the brother of Poondi Kalaiselvan, a former DMK leader from the region who was …