Prime Minister Narendra Modi today responded to Mayawati's allegation that he was using his caste to win votes, saying he has never indulged in caste politics despite fighting many elections in Gujarat. "I have only one caste - poverty. That's why I have rebelled against poverty," he said at a rally in Ballia, Uttar Pradesh, pointing once again at his humble background that had become one of the key issues in the 2014 election.