Karthik Madhavan GREETING THE CROWD: Congress president Sonia Gandhi at a public meeting in Erode on Thursday. (From left) Union Minister E.V.K.S. Elangovan; Congress observer for Tamil Nadu Arun Kumar; TNCC president K.V. Thankgabalu and Union Minister G.K. Vasan are in the picture. ERODE: Congress president Sonia Gandhi has said that nuclear power is crucial for meeting the country