Launching the ruling BJP's campaign in Bengal for the national election due by May, Amit Shah today mocked the mega opposition rally organized by Chief Minister Mamata Banerjee on Saturday. There were 23 parties and nine prime ministerial candidates at that gathering at Kolkata's Brigade Ground, the BJP president said at a rally in Malda. Amit Shah's rally almost didn't happen; he was cleared to land his chopper at the airstrip in Malda at the last minute. His attacks on Mamata Banerjee and her Trinamool Congress started from the word go.