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Nick Robinson discusses what makes a good party election manifesto, and what pledges can cause problems later, with the former cabinet ministers David Willetts and Alan Johnson. He talks to the American pollster Frank Luntz for an international perspective, and to the former Conservative press officer Gabby Bertin about what can go wrong in a campaign and how to stop it from happening. And he reflects on some of the week's statements that he finds particularly striking.

Editor: Martin Rosenbaum.