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By Sanjeev Miglani NEW DELHI (Reuters) - - India's Hindu nationalist opposition party vowed on Monday to seize the momentum from a string of big state poll victories and smooth the tough job of broadening its appeal beyond traditional northern strongholds in time for a national election next year. A group led by the Bharatiya Janata Party (BJP) aims to tap into a wave of anger against the ruling Congress, a leader said, after India's grand old party lost vote counts on Sunday in four of five states that have held elections over the past month. The Congress was ahead only in the tiny state of Mizoram in India's remote northeast, having lost in the big heartland states of Madhya Pradesh, Rajasthan and Chhattisgarh, besides the national capital, Delhi. "There is no question there is an anti-Congress wave gathering momentum," said senior BJP leader Arun Jaitley.