Poriborton (change) has come to Bengal. On Friday, minutes after 1 in the afternoon, Mamata Banerjee took oath to become the first woman Chief Minister of West Bengal. It was a historic moment for the state and personally, one that the diminutive giant-slayer has waited for all her life. Mamata took oath in Bengali marking a change of guard that will see the end of 34 years of uninterrupted rule by the CPI(M)-led Left Front.