"Lalu aadarsh Yaduvanshi bane aur paapi party ka saath chhor kar Narendra Modi ko Pradhan Mantri banaye (Lalu should become an ideal Yaduvanshi and leave a wicked party to help Narendra Modi become PM)", Ramdev told reporters here.
He also took a dig at Chief Minister Nitish Kumar for refusing to recognise him and reminded him that he had in recent past declared him as "Brand Ambassador of Bihar".
The yoga guru said he would campaign against Congress President Sonia Gandhi and her son and Vice President Rahul Gandhi in Rai Bareili and Amethi in the coming Lok Sabha elections.
Stating that Modi would be a reliable PM, the yaga guru said he would launch a door to door campaign for Modi in different parts of the country from March 1.