In 1883 a grass-roots political organisation was founded that re-shaped Victorian politics. The Primrose League signed up a million members and an army of Conservative activists who helped win elections by reaching out to new Tory voters in industrial cities and rural shires. Today another innovative grass-roots organisation is proving influential. Emerging from Jeremy Corbyn's 2015 leadership campaign, Momentum has proved highly effective at winning over new Labour voters, swapping the magic lantern shows and Stately Home fetes of the Primrose League for a cutting edge social media campaign. Jonathan Freedland and his guests compare electioneering in the nineteenth century and today and explore the often troubled relationship between grass-roots organisations and the parliamentary parties they support . They also ask whether the Conservatives need a latter-day Primrose League to boost their electoral appeal, particularly with younger, urban voters. Joining Jonathan are Dr Jon Lawrence of the University of Cambridge, James Kanagasooriam of Populus and the journalists Sebastian Payne and Ellie-Mae O'Hagan. Laura Morgan is the reader. Producer: Julia Johnson.