Ritabrata Banerjee, the 46-year-old rebel Trinamool Congress (TMC) leader now officially recognised as the Leader of Opposition in the West Bengal Assembly, faces his first major electoral examination as his breakaway faction contests the upcoming October 2026 Assembly by-elections in Nandigram and Rejinagar. With Wednesday, 15 September 2026 marking the last day for filing nominations, the rebel faction's decision to field candidates in both seats has placed Ritabrata in direct confrontation with Trinamool chief Mamata Banerjee, now 71, at the hustings for the first time.

The Two Seats and What They Represent

The choice of Nandigram is loaded with symbolism. It was here that Mamata Banerjee famously lost to Suvendu Adhikari in the 2021 Assembly elections, before returning to power through a by-election from her home constituency of Bhabanipur. Ritabrata had initially signalled that his faction would avoid Nandigram if Mamata chose to contest there herself — a tacit acknowledgement of her dominance in that seat. With Mamata reportedly staying out of the race this time, the rebel faction has moved in.

Rejinagar, located in Murshidabad district — where an estimated 70 per cent of the population is Muslim — carries a different calculus. The seat was won last year by the Aam Janata Unnayan Party, founded by Humayun Kabir, complicating a straightforward TMC-versus-rebel read. For the Ritabrata faction, the vote share in Rejinagar may matter as much as the result in Nandigram.

Who Is Ritabrata Banerjee

Ritabrata's political journey began in the student politics of Kolkata. A graduate of Asutosh College and later Calcutta University, he rose through the Students Federation of India (SFI) — the student wing of the Communist Party of India (Marxist) [CPI(M)] — eventually becoming SFI national general secretary in 2008. His oratory and organisational skills earned him recognition, but his career was also marked by controversy: he was expelled from the CPI(M) in 2017 over alleged misconduct and clashes with senior leadership.

He then served out his Rajya Sabha term as an independent before joining the Trinamool Congress in 2020, securing another Rajya Sabha term in 2024. At the 2026 Assembly elections, he won the Uluberia Purba constituency in Howrah district on a Trinamool ticket, defeating his closest Bharatiya Janata Party (BJP) rival by approximately 11,800 votes. Following the Trinamool's broader electoral defeat, he turned rebel — alleging wrongdoing within the party — and was subsequently recognised as the official Leader of Opposition in the West Bengal Assembly, heading a breakaway group of MLAs.

The Party Symbol Battle and National Implications

The factional dispute is not confined to polling booths. Ritabrata's group is locked in a contest with Mamata's camp before the Election Commission of India (ECI) over the right to the Trinamool's name, organisational assets, and the party's twin-floret symbol. No final decision has been issued yet. The dispute has drawn national attention, as Ritabrata is increasingly viewed as a figure who could fracture one of India's most powerful regional parties.

Analysts draw parallels with earlier intra-party splits. His trajectory has been compared to that of Eknath Shinde, who carved a majority out of the Shiv Sena, though Shinde's contest was against Uddhav Thackeray — not the party's founder. A closer comparison, some argue, is Ajit Pawar, who broke from his uncle Sharad Pawar over the Nationalist Congress Party (NCP) — a fight over the 'original' claim that continues even after Sharad Pawar's death. The Samajwadi Party precedent is also cited: Akhilesh Yadav took effective control of the party in a January 2017 internal coup before going on to rebuild its electoral base.

Opposition Vote Split and the BJP Angle

Some analysts argue that the rebel faction's presence on the ballot could split the Opposition vote, potentially benefiting the ruling BJP. Critics contend that Ritabrata is positioning himself as Mamata's primary rival while implicitly aligning with the Suvendu Adhikari-led state government — an allegation the rebel faction has not publicly addressed.

Notably, within his former party, reactions to Ritabrata remain sharply divided. Former CPI(M) colleagues describe him as ambitious and flamboyant; Trinamool loyalists dismiss him as an opportunist; while his own colleagues in the rebel faction claim he has provided a platform to challenge earlier wrongdoings within the party.

What the October By-Elections Will Decide

The October 2026 by-elections are unlikely to redraw West Bengal's political map on their own, but they will serve as a credibility test for Ritabrata's breakaway project. A strong vote share — even without a seat win — could consolidate his legitimacy with the ECI, strengthen his claim to the Trinamool brand, and signal whether the rebel faction has an independent voter base or is purely a creature of anti-Mamata sentiment. The results will be watched closely across the country for what they reveal about the durability of regional party splits in Indian democracy.