In a but obvious call, West Bengal's ruling party Trinamool Congress (TMC) on Sunday officially declared Chief Minister Mamata Banerjee as its candidate for the Bhabanipur by-polls.
Mamata, who lost the Assembly election from the Nandigram seat, needs to win this by-poll to retain her chief minister's seat.
TMC has already started campaigning in south Kolkata, with the Election Commission announcing that the by-poll will be held on September 30, following a request from the state government to avoid a constitutional crisis.
The Bharatiya Janata Party, Congress, and CPI(M)-led Left Front is yet to announce their candidates for the by-poll. By-polls will be held along with the elections to two remaining seats in the Murshidabad district - Samserganj and Jangipur, where polling could not be held during the eight-phase assembly polls earlier this year.