2015 Labour Party leadership election (UK)
When Corbyn entered the election, he was considered unlikely to win. However, support for him increased quickly. Opinion polls showed him leading against the other candidates. This led to warnings from people such as Gordon Brown, Tony Blair, Jack Straw, David Miliband, and Alastair Campbell. Many of them claimed that Corbyn's election as leader would leave the party unable to win elections. Corbyn won the election in the first round, with 59.5% of the votes.