India, March 23 -- Congress MP and the party's former state president Pradyut Bordolai joining the Bharatiya Janata Party (BJP) right before the forthcoming assembly elections in Assam is a big setback to the Congress. It is an even bigger setback to Gaurav Gogoi, the Congress's de facto face in the state. Gogoi's father, Tarun Gogoi revived the Congress party in the state and served as the chief minister from 2001-2016, making him the longest serving in the history of the state. One of his protegees, Himanta Biswa Sarma, is now the BJP's chief minister in the state. Sarma is, in fact, the only former Congress-to-BJP turncoat who has been given the chief minister's post in a large state. What is the nature of the challenge facing the Cong...