How do you explain the Lib Dems’ stunning victory?

In a political upset the Liberal Democrats have won the by-election in Chesham and Amersham in a massive poll swing from the Tories. 

‘What they’ve done is overturned a majority of 16,000 and then they’ve had quite a few votes to boot!’ – Katy Balls

And in other political the new DUP leader Edwin Poots has resigned, leaving his party to figure out what to do next. To dissect what happened, Cindy Yu is joined by James Forsyth and Katy Balls.