Prior to casting his vote Prasad, who was accompanied by his 88-year old mother, expressed the confidence that he will win.
In Chandni Chowk, sitting BJP MP and Union Minister Dr Harsh Vardhan is contesting against four-time Lok Sabha MP and Congress leader Jai Prakash Agarwal.
The appeal came as polling began for the final phase of Lok Sabha polls in 59 seats to decide the fate of 918 candidates.
Last month, Rajbhar submitted his resignation from the Yogi Adityanath's BJP-led ministry, but it is yet to be accepted.
Polling will be held from 7 am to 6 pm in the 13 parliamentary constituencies in Punjab and the lone Chandigarh constituency.
Also in the running are former state BJP president Nandkumar Singh Chauhan and senior Congress leader Meenakshi Natrajan.
The protesters shouted slogans against the Delhi CM for defaming the state over drugs and asked him to go back.