Hillary Clinton, Donald Trump and Bernie Sanders descend on Iowa state fair

The three most colourful contenders in the American presidential race descended on Iowa State Fair on Saturday, bringing a new, frenzied, sight to the annual celebration of livestock and deep-fried treats.

Hillary Clinton, the Democratic front-runner was introduced to a farmer’s prized cow. Bernie Sanders, her closest rival, raged about the injustice of income inequality to a packed crowd from a stage wedged among fast-food trucks.