Akshaye Khanna and Anupam Kher are the mainstays of the movie. One could try watching the film once for them, but that too could be a difficult task as the screenplay of the movie is weak. The interest is not sustained until the end.
Vijay Ratnakar Gutte directed the movie which was based on the book, The Accidental Prime Minister by Sanjay Baru. The book was definitely more engaging than the film. If you are interested to know some background about the political workings of Congress party and what made them pick Manmohan Singh as Prime Ministering, it might offer some respite.