In the US, Taylor Swift could have the power to swing the presidential election. As famous faces come out to back Keir Starmer's plans for the arts, we ask when a celebrity endorsement can boost a campaign... and when it can go badly wrong.

The political masterminds Peter Mandelson, Polly Mackenzie and Daniel Finkelstein join Matt Chorley to discuss star power, and who could be the next Conservative leader - could the runners and riders include Michael Gove and even David Cameron?

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