With three weeks to go until the Makerfield byelection, where an Andy Burnham victory could change the direction of the Labour party, Pippa Crerar joins him on the campaign trail in Wigan and Leigh, speaking to voters on their doorsteps. Help support our independent journalism at <a href="https://www.theguardian.com/politicspod">theguardian.com/politicspod</a>