.NO PRESIDENTIAL dispute has had as much influence on an election as that in between Joe Biden and Donald Trump on June 27th. Mr Biden's efficiency was therefore disastrous that his own event pushed him to leave. Due To The Fact That Kamala Harris, the vice-president, changed him as the Democrats' candidate the nationality has actually firmed up. It is currently a toss-up, according to The Economist's style. On September 10th Ms Harris will certainly encounter Mr Trump in a 2nd governmental controversy. How much distinction will this one help make?