A series of tweets last month by Chandra Kumar Bose, the vice president of the BJP’s West Bengal unit, laid bare the deep chasm within the party in a state it is desperate to win. “What is the party President @BJP4Bengal doing? Is he sleeping?” Bose wrote in the micro blogging site, accusing Dilip Ghosh, the state unit president, of not doing enough to bail out an arrested youth leader. “He (Ghosh) doesn’t hesitate to use abusive language against our opponents, which is having a detrimental effect on the electorate,” Bose wrote.