For both the BJP and the Opposition, the election results in West Bengal, Tamil Nadu, Assam, and Kerala on Monday carry the potential of causing a churn within the parties themselves as well as reshaping the contours of national politics, with the impact of the verdicts likely to be felt far beyond the boundaries of the states. If the projections of most of the exit polls prove to be accurate, the BJP is likely to edge past the Trinamool Congress (TMC) in West Bengal. That will be a big success for the party’s attempts to reinforce itself as the most dominant pan-regional force in the East, where it is already in power in Odisha and Bihar. The party is expected to win Assam with a resounding mandate, as per the pollsters, while down South, its attempts to establish itself as a serious force may continue as actor Vijay’s TVK is expected to undercut its momentum in Tamil Nadu .…