Less than a day after Trinamul Congress supremo Mamata Banerjee gave a clarion call for "Opposition unity" from her dharna platform in Calcutta, ripples of coalescence were felt from down south in Chennai. Sources confirmed The Telegraph Online that some 20 Opposition parties are likely to attend a meeting to deliberate on "Social Justice: The Road Ahead" on 3 April, Monday in the Tamil Nadu capital where representatives of at least two ruling parties in states with a history of maintaining close ties wi...