By-elections to nine state assembly constituencies were held in Tamil Nadu in four separate phases. Election for Thirumangalam was held on January 9 and for Bargur Thondamuthur Ilayankudi Cumbum and Srivaikuntam constituencies on August 18. Also election took place for Vandavasi and Tiruchendur constituency on December 19 2009 and finally for Pennagaram constituency on March 27 2010.
