Three weeks after her Mahagathbandhan mega rally in Kolkata, West Bengal Chief Minister Mamata Banerjee is in New Delhi to take forward efforts to form a "United India Opposition" and rally to save the Constitution and democracy. The sit-in dharna she will join at Jantar Mantar is being loosely labelled "Mahagathbandhan 2.0". Delhi Chief Minister Arvind Kejriwal is playing to this round of opposition muscle-flexing.