If the exit poll projections turn out to be true, the BJP’s attempts to reinforce itself as the most dominant pan-regional force will be a success in the East, where the party is already in power in Odisha and Bihar. (PTI) Winning Bengal for the first time , dislodging the DMK from power in Tamil Nadu along with ally AIADMK, making gains in Kerala , and retaining Assam with a larger mandate. This is what a happy Monday will look like for the BJP as votes are counted for the Assembly elections in the four states and the Union Territory of Puducherry. However, the exit polls have thrown up a mixed bag for the BJP, with anxiety and doubts persisting about whether it can bring down the Mamata Banerjee government in West Bengal. In Tamil Nadu , the party is worried about actor Vijay’s TVK undercutting its momentum, and in Kerala, it finds itself navigating a triangular contest dominated by the traditional rivalry between the LDF and UDF.…