"We contested the two seats. Won both the seats. Congratulations to the voters,'' a beaming Mamata told reporters at the state secretariat shortly after her return from Delhi.
Election Commission sources said that TMC candidate Minati Mishra won the Bankura seat by a margin of 15,139 votes defeating her nearest CPI(M) rival Nilanjan Dasgupta.
Kashinath Mishra, whose death caused the by-election in Bankura, had won the seat by a margin of 29,080 votes in 2011 Assembly poll.
TMC candidate Mamata Bhuniya defeated Samar Mukherjee of the CPI-M in Daspur West Midnapur district by 18,919 votes.
The by-election in Daspur was necessitated by the death of sitting TMC MLA Ajit Bhuniya.
The Congress did not field any candidate in any of the two seats.
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The TMC victory came close on the heels of its recent civic election success which saw the ruling party winning four of the six municipalities.
Trinamool Congress deputy leader in state Assembly Partha Chatterjee also congratulated the voters of Daspur and Bankura for ensuring the victory of TMC candidates and reposing faith on the party.