L-R: Chuka Umunna, Yvette Cooper and Andy Burnham (Image: New Statesman) In Britain, commentators often talk about how 2016 was one of the most defining years in modern British politics. To a certain degree, they're right - the fallout of the Brexit referendum, which took place now more than 10 years ago, is still raw and, arguably, we have not recovered. Now that Sir Keir Starmer has resigned as Prime Minister, the country will soon welcome its seventh leader since that fateful vote a decade ago. King Charles must be bewildered at the thought that he will soon be confirming his third Prime Minister since the start of his reign almost four years ago, when his mother, Queen Elizabeth II, was in the same position eleven years into hers. However, despite the madness of 2016, I want to trace back to the year before. When the Conservative Party won an overall majority at the 2015 general election, the Labour Party had a lot of soul searching. The party was convinced it had the keys to D...