In poll bound Tripura two arch rivals, the Left and the Congress, have formed a political friendship with a seat sharing alliance to take on the ruling BJP. This arrangement comes after the failure of a similar alliance in West Bengal's election.. In Tripura, the task is difficult as there is a history of political violence between the Left and Congress. NDTV's Ratnadip Choudhury reports on the joint campaign of Congress heavy weight Sudip Roy Burman and finds out if Congress and the Left are indeed able to join forces.