Mocking the CPI(M) and Congress for their efforts to forge an alliance ahead of the Assembly polls in Bengal, Trinamool Congress chief Mamata Banerjee on Friday termed it a “mistake”.

“If you sacrifice your ideology for the sake of power and money, what is left with you? I am neither Left nor Right. I am progressive. A person may die but his/her ideology lives on. They (Congress and CPI(M)) are committing a mistake,” Banerjee said at a TMC meet here.

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