The contestants include Trinamool Congress' Mamata Banerjee, Varun Gandhi of Bharatiya Janata Party, former cricketers Mohammad Azharuddin and Navjyot Singh Sidhu and film star turned politician Vinod Khanna.
Prime Minister Manmohan Singh, electioneering in Punjab, exuded confidence of the Congress emerging as the single largest party.
BJP's aspirant for the top job L K Advani was also in Punjab praising party ally Akali Dal's government in Punjab.
BJP spokesperson Ravi Shanker Prasad told reporters: "Manmohan Singh looked pessimistic and defeated. The campaign of Congress lacks maturity and no one knows who is saying what. UPA is Ulta Pulta Alliance (topsy turvy)."