In the times of aggressive film promotions, Ajay Devgn is doing his bit too. The actor has launched a contest for his forthcoming film "Raajneeti" on social networking site Facebook. "Let's have a cool contest on 'Raajneeti'. From May 21 to June 4, I will put up four topics hinging on politics and would like to find out the best online speaker. "I would meet the winner in person over a cup of coffee, maybe and of course, the winner gets to go home with a 'Raajneeti' goodies bag, " the actor posted on his Facebook page. Political drama "Raajneeti" is slated for a June 4 release. Directed by Prakash Jha, it also stars Arjun Rampal, Katrina Kaif, Ranbir Kapoor, Manoj Bajpai, Nana Patekar and Naseeruddin Shah.