James Tapsfield: A defining election moment as soon as next month?

There's three years to go until the General Election, but are we about to see a defining moment as soon as next month?Andy Burnham is testing the theory of whether he really is the King of the North.The Manchester mayor is betting the house on taking the seat of Makerfield in a by-election. Even though all the polls have been shown that Reform is set to storm the seat.If he wins, Burnham will be the next Prime Minister.If he loses, Labour will be thrown deeper into chaos and Nigel Farage can effectively start measuring the curtains for Number 10.