New Delhi, May 4 -- In a seismic shift that rewrote decades of political history, the Bharatiya Janata Party breached what many had called Mamata Banerjee's impregnable fortress - West Bengal, in stunning style on Monday, as counting day delivered one of the most dramatic verdicts in Indian electoral history.

Prime Minister Narendra Modi arrived at the BJP headquarters in New Delhi to a roaring crowd of elated workers. But his opening words were not of conquest - they were of responsibility.

"The lotus did not merely bloom in Bengal. It erupted, from Gangotri to Gangasagar, from the Himalayan foothills to the Bay of Bengal - in what Prime Minister Narendra Modi called, without hyperbole, "a historic, unprecedented day."For years, politica...