The party won a historic victory in the 2011 West Bengal Legislative Assembly election by defeating the 34-year-long Left Front rule, world's longest democratically elected communist government. It has won a three-time majority in the West Bengal Legislative Assembly and has been the ruling party in West Bengal since 20 May 2011. AITC is led by Mamata Banerjee as the chairperson of the party.
^"The Bengali card: Is Mamata trying to give TMC a new ideological core?". India Today. 26 November 2020. The TMC has decided to counter the BJP's Hindutva majoritarian politics by invoking Bengali sub-nationalism ahead of the State Assembly polls. With Mamata Banerjee setting the tone herself, TMC leaders have started attacking the BJP as a party of 'outsiders' trying to mount an assault on Bengalis.
^Debnath, Kunal; Chatterjee, Souvik (1 August 2021). "Populism in Electoral Politics: What We Learnt from the West Bengal Assembly Elections 2021". Academia Letters, Article 2855. SSRN3905238.
^Das, Ritanjan; Nielsen, Kenneth Bo (2 April 2024). "Consolidating a political dynasty: Abhishek Banerjee, the Trinamool Congress, and the 2023 panchayat elections in West Bengal". Contemporary South Asia. 32 (2): 194–201. doi:10.1080/09584935.2023.2296899.