Some of the Congress MPs from Orissa today staged a dharna in front of the Parliament House demanding resignation of the Orissa Chief Minister Naveen Patnaik. The MPs shouted slogans alleging Patnaik's involvement in a landscam of 8,000 acres in the state. The members who took part in the demonstration include Hemananda Biswal, Bhakta Charan Das, Ramchandra Khuntia and Pradeep Majhi.