NEW DELHI - India's ruling party alliance will sweep a majority of parliamentary seats up for grabs in the election starting April 11, a nationwide opinion poll has shown.The coalition led by Prime Minister Narendra Modi's National Democratic Alliance could win 264 seats in the election compared to 141 for the Congress party-led opposition alliance, according to the CVoter opinion poll televised on a local channel on Sunday. A total of 543 seats are up for grabs in the election.Results of the opinion poll were released following the announcement of the election schedule.