Janan Ganesh: Ukip votes could be decisive

Ukip has been upstaged by the SNP in recent weeks, but the party could still be the decisive variable in this election. Polls show its share of the vote holding up at about 13 per cent - putting the Conservatives in mortal danger, but if a quarter of those votes dispersed, the outcome could be very different.  See acast.com/privacy for privacy and opt-out information.