Bengal Chief Minister Mamata Banerjee -- who declared yesterday that the INDIA bloc will not take a call on its Prime Ministerial candidate until after the Lok Sabha election -- took a 180-degree turn today by proposing Congress chief Mallikarjun Kharge's name for the position. Mr Kharge, however, poured cold water on the plan with a polite refusal, sources said. He said he only wants to work for the downtrodden. Key challenge ahead is to finalise seat sharing arrangement before the big 2024 polls.