After 10 years, Tamil Nadu will go for urban local body polls on Saturday. Twenty-one cities including Chennai, 138 municipalities and 490 town panchayats will elect more than 12,000 members. Over the last five years, these bodies did not have elected representatives as elections were not held. This time the ruling DMK has taken up national issues on federalism and state autonomy. Chief Minister M K Stalin has even launched a federation for social justice in a bid to bring together several non-BJP parties across India.