The Staggers 26 June 2015 Tessa Jowell secures the backing of more than half Labour's local authority leaders Tessa Jowell's campaign has recieved another boost with the endorsements of more than half of London Labour local authority leaders. Tessa Jowell, the frontrunner for Labour's mayoral nomination. Photo: Getty Images Sign UpGet the New Statesman\'s Morning Call email. Sign-up 13 of the London Labour party’s 21 local authority leaders have endorsed Tessa Jowell’s bid for the party’s mayoral nomination in an open letter to the New Statesman. The council leaders – who come from across the capital and include the elected Mayors of Hackney, Jules Pipe, and Newham, Sir Robin Wales – highlight Jowell’s popularity. “Labour hasn’t won a general election or a mayoral election since 2005,” the council leaders warn. The party “must start winning elections again, starting with the London mayoral election in 2016”. They describe Jowell as the candidate with “the best prospect of success in that contest”, highlighting a recent poll that found she was the only candidate who polled above Zac Goldsmith, the likely Conservative candidate, beating him by 57 per cent to 43 per cent. The council leaders have been joined by three Labour group leaders, Emma Dent-Coad, Adam Hug and Alison Moore, who represent the party in opposition on Kensington, Westminster and Barnet councils. The full letter is below: Labour hasn't won a general election or mayoral election since 2005. The Labour Party must start winning elections again, starting with the London mayoral election in 2016. We believe that our work across our boroughs to promote ambition, aspiration, jobs, and growth, together with our support for the most vulnerable in our communities provides a strong base for Labour success. But it's vital that Labour chooses the Mayoral candidate who can reach out to voters across London - and recent polls show that Tessa Jowell would defeat the likely Tory candidate by 57% to 43%. Tessa will provide the Labour Party with the best prospect of success in that contest. Her One London message represents the values and visions that we share, and she has a record of delivery for Londoners that is unparalleled. We are proud to endorse Tessa as Labour's best chance of winning again in London. Cllr Jas Athwal (Leader, Redbridge council) Cllr Julian Bell (Leader, Ealing council) Cllr Stephen Cowan (Leader, Hammersmith and Fulham council) Cllr Sarah Hayward (Leader, Camden council) Cllr Denise Hyland (Leader, Greenwich council) Cllr Peter John (Leader, Southwark council) Cllr Clair Kober (Leader, Haringey council) Cllr Tony Newman (Leader, Croydon council) Cllr Lib Peck (Leader, Lambeth council) Mayor Jules Pipe (elected Mayor, Hackney council) Cllr Chris Robbins (Leader, Waltham Forest council) Cllr Darren Rodwell (Leader, Barking and Dagenham council) Mayor Sir Robin Wales (elected Mayor, Newham council) Cllr Emma Dent-Coad (Labour group leader, Kensington and Chelsea council) Cllr Adam Hug (Labour group leader, Westminster council) Cllr Alison Moore (Labour group leader, Barnet council) › A view from Athens: is a “backflip” by Syriza in the Greek debt crisis negotiations inevitable? Stephen Bush is political editor of the New Statesman. His daily briefing, Morning Call, provides a quick and essential guide to domestic and global politics. Subscribe For daily analysis & more political coverage from Westminster and beyond subscribe for just £1 per month!