The BJP is celebrating Prime Minister Narendra Modi's Bengal visit on Wednesday with a double barrel gun. At Siliguri, he called West Bengal Chief Minister and Trinamool chief Mamata Banerjee "Speed Breaker Didi", blaming her for Bengal lagging behind in development because central schemes were running into the Mamata wall, as he put it. In Kolkata, he accused her of Congress style dynasty politics. "The bua-bhatija dynasty style politics has to end in Bengal," he said.