The SFI attack on Bengal finance minister Amit Mitra in New Delhi has gifted Mamata Banerjee a chance to turn the tide and sink the revival hopes of the CPM that is still counting the costs of the tactical blunder.The Bengal chief minister was today admitted to a private clinic after she cut short her visit to an "unsafe' Delhi and returned to Calcutta. She is being treated for breathlessness, pain in the joints and low blood pressure. Read