The GMB union’s nomination of Lisa Nandy for Labour leader means that she now needs the endorsement of only one more Labour party affiliated body to reach the final stage of the leadership election. That should not be too difficult. It also gives her a powerful backer in the ongoing race. GMB has deep reserves of funds, lots of activists, and contact lists of Labour members which will be of great help when canvassing. The endorsement also cements Nandy’s rapid ascent from speculative candidate, to dark horse, to serious candidate for the leadership.