These days when we talk about politicians we are more likely to discuss whether they are authentic than whether they are great orators or statesmen or women. Few of us take the time to listen to a speech or read a manifesto and when we judge politicians we more often focus on whether they seem sincere, warm or passionately committed to a cause rather than weighing up their policy programmes . We're turned off by spin and cynical about many politicians' motivations and we seek reassurance that they can really be trusted.

Professor Rosie Campbell asks how we can make judgements about a politician's authenticity. Are politicians more trustworthy if they stick to their principles without compromise? Or is authenticity about revealing our true character, warts and all? And what is better for democracy? Authentic leaders who are straight talking and stick rigidly to their ideals or leaders who are willing to negotiate behind the scenes?

Producer: Ben Carter.