After months of one step forward and several back, the competing factions of Tamil Nadu's ruling AIADMK have agreed in principle to merge, with leaders talking of a union by August 15. The leaders of the two wings, former Chief Minister O Panneerselvam ("OPS") and his successor, E Palaniswami ('EPS"), are expected to meet Prime Minister Narendra Modi tomorrow, which would signal their best efforts yet to bury their differences, some of which rest on who will head the Tamil Nadu government.