'I am a gaffe machine': a history of Joe Biden's biggest blunders

As the former vice-president enters a crowded 2020 field, will his well-documented past of confusing and embarrassing moments work against him? In March Joe Biden seemed to accidentally let it slip he was running for president, saying at a dinner for the Delaware Democratic party that he has ‘the most progressive record of anybody running’.Photograph: Manuel Balce Ceneta/APAfter months of speculation and hinting, Joe Biden has officially announced his candidacy for the Democratic nom