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KOLKATA: Bengal politics is taking a bipolar course with BJP fast occupying the space of the Left and Congress across the state.The defining trend is evident from the results of the recently held seven civic polls in which Narendra Modi’s party secured a 41.7% vote share in Jalpaiguri’s Dhupguri municipality for the first time, a spectacular jump from the 8.6% share in 2012.Dhupguri has a sizeable scheduled caste (Rajbanshi) and scheduled tribe population. It is 95km from Naxalbari, where BJP chief Amit Shah in April visited an adivasi family whose members were later forced to join Trinamool. Despite this, BJP has made inroads among Rajbanshis and SC/ST across the seven municipalities.In terms of vote share, the party is ahead of the Left and Congress taken together in Haldia, Dhupguri and Panskura municipalities, and has come second in Durgapur and Nalhati. Its vote share is the same as that of the Left in Cooper’s Camp. The surge in BJP’s vote share is enough to put to rest the debate over the Left-Congress handholding to keep BJP at bay in Bengal.Polls held under West Bengal State Election Commission have never been above controversy, and the polls in question are no exception. The opposition’s clamour against rigging by Trinamool gains ground from the 43.4% hike in Trinamool’s vote share in Cooper’s Camp in Nadia compared to 2012, a 38.4% spurt in Haldia and a 26% spike in Durgapur. All these gains can’t be explained by Congress leader Sankar Singh joining Trinamool in Cooper’s Camp and Lakshman Seth leaving CPM in Haldia.In these places, Trinamool seniors Sankar Singh, Suvendu Adhikari and Aroop Biswas might have taken former CPM leader Anil Basu’s route in Hooghly’s Arambagh that once gave him the highest margins in Lok Sabha votes.Yet, the Left and Congress can’t hide their eroding base by blaming rigging. Even if Left leaders keep heaping allegations on the Trinamool toughs who had driven out CPM polling agents from booths in Haldia and Durgapur, such a situation was not unforeseen by Alimuddin Street. CPM state secretary Surjya Kanta Mishra had appealed to party activists and supporters a day before the polls to stay around the booths and foil efforts to loot votes. With more than 1 lakh party card holders in Bengal, CPM has now come to a stage where it can hold impressive rallies but can’t attract people.The situation is the reverse for BJP. It has been gaining mass support since the 2014 Lok Sabha polls but doesn’t have able organisers and a credible Bengali face to give the final push to Trinamool.All these have gone to the advantage of Trinamool that won 140 of the 148 wards, averting the anti-incumbency getting transferred in the EVM. Mamata Banerjee will sail safe with the divided opposition as long as BJP remains a distant second.