Youth Congress firebrand leader Mamata Banerjee formed Trinamool Congress in 1997 by abusing AICC President Sitaram Kesari and calling him "Bandicoot" 🐀in a massive rally in Kolkata. Mamata was angry with Kesri for supporting her arch rival Somen Mitra, then PCC President. However Somen Mitra joined TMC in 2009 and later went back to Congress to became PCC President again.
Mamata's TMC became BJP led NDA partner from 1998 to 2008. Meanwhile she left NDA on Tehelka sting on Defence corruption in 2001 and joined back in 2003. When Communists, left Congress led UPA in 2008, TMC became UPA partner till 2013. Meanwhile in 2012, when Congress proposed Pranab Mukherjee, she tried to flex muscles. But seeing general Bengal mood, she supported Pranab Mukherjee.
From 2016 - she alone won West Bengal election and Congress allied with Left and both decimated. Then in 2024, she was part of INDIA Bloc - but never allowed alliance with Congress in the State. Now after 15 years rule, her party TMC collapsed in 2026 Assembly election.... 😎