Dr. Manmohan Singh should resign as from his post as prime minister. The perception of his administration has been tainted by the corruption scandals involving two of his handpicked senior ministers, railway minister Pawan Bansal and law minister Ashwani Kumar. This has undermined the people's trust. Anything else Singh tries to accomplish while in office will assumed to be corrupt, until proven otherwise, a lengthy process.
Dr. Manmohan Singh has been a great Prime Minister of India and even though his image is tarnished a little bit, he should not resign. There isn't a politician alive that doesn't have some kind of scandal that damages their image. He is a good Prime Minister and should stay on to finish out his term.