7. Mamata Banerjee: Known as 'Didi', she is the first woman to become the Chief Minister of Bengal. In 2011 Banerjee pulled off a landslide victory for the TMC Congress alliance in West Bengal by defeating the world's longest-serving democratically-elected communist government, the Communist Party of India (Marxist)-led Left Front government, bringing to an end 34 years of Left Front rule in the state.