The BJP is a formidable political force in Bengal and cannot be underestimated, poll strategist Prashant Kishor said today, asserting, however, that Mamata Banerjee remained the most powerful leader in the state. "Make no mistake. The BJP is a formidable political force in Bengal and there are no two ways about it. But after factoring in everything, the BJP will not cross 100 and the Trinamool is going to win... and they are winning big," Prashant Kishor told NDTV after his comments on a Clubhouse chat with journalist describing Prime Minister Narendra Modi as a popular leader in Bengal and listing factors favouring the BJP in the state polls caused a sensation on the weekend.