Ailing in opinion polls, Joe Biden will aim to jump-start his re-election campaign in the coming week with events designed to symbolise the fight for democracy and racial justice against Donald Trump. The Biden-Harris campaign announced the plans in a conference call with reporters that mentioned Trump by name 28 times in just 24 minutes, a sign of its determination to draw a sharp contrast between the US president and his likely Republican challenger. On Saturday Biden will deliver a major address laying out the stakes of the election at Valley Forge, near Philadelphia, the site of a 1777-1778 winter...