Makerfield: What are the polls saying?

On Thursday, Makerfield goes to the polls in the most consequential by-election in a generation.   Can Andy Burnham finally gain the parliamentary seat he needs to enter the Labour leadership race? Will Robert Kenyon and Reform stop Burnham's charge to Downing Street and further cement their status as Labour's inevitable successors?   Anoosh Chakelian is joined by senior data journalist Ben Walker to discuss.