Addressing a press conference here, Thakre said he had sent his resignation to Congress President Sonia Gandhi.
"People have given us a mandate to play the role of opposition, and we will be a constructive opposition," he said, adding that despite the good performance of the Congress-led state government, the party could not counter BJP's "false propaganda".
To a question, he said it would be wrong to blame former Chief Minister Prithviraj Chavan alone for the defeat.

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