Prashant Kishor: The X-Factor in Bengal Politics Holding Sway Over TMC Poll Campaign In the coming assembly elections, the battle for Bengal may be between Modi and Mamata, but is also between Amit Shah and Prashant Kishor. Prashant Kishor. Image: Anindito Mukherjee/Reuters Politics14/Feb/2021 Kolkata: On Friday, after Trinamool Congress (TMC) veteran Dinesh Trivedi announced his resignation from the Rajya Sabha in a surprise move, he echoed what a number of TMC defectors have said before joining the Bharatiya Janata Party in recent months â that the party was no longer under Mamata Banerjeeâs control and that it had been taken over by a corporate agency.