Kolkata: Lakhs of leaders gathered at Kolkata to show strong opposition against the government prior to the Lok Sabha election through the mega rally of anti-BJP parties led by TMC supremo Mamata Banerjee. The United India Rally, as it was named, had participation from 15 different anti-BJP parties. Around 23 political leaders attended the mega rally held at Brigade Parade ground. Mamata Banerjee said that the right candidate for the post of prime minister will be chosen after the election.