Andy Burnham has won the Makerfield by-election, and that means Labour now has two new races to run: the first is for the position of Labour leader, and the second is for the mayor of Greater Manchester. The first will be restricted to Labour MPs, obviously, but the second will be open to any candidate who can raise the deposit. Such candidates may want to think twice before putting the money down, however, as the Greens are confident it’s going to be a two-horse race between them and Labour: We said it was Greens vs Reform in Gorton and Denton, and…