 Donald Trump's raw political instincts were on display when, as he was being rushed off stage, he deliberately stopped to defiantly raise his fist in the air. He will almost certainly benefit from an initial boost in support, from voters appalled by what's happened and impressed by his response, while his supporters are expressing new levels of devotion and admiration. This incident will inevitably reshape the entire election campaign. The Biden campaign is taking down TV adverts that attack Donald Trump.