.NO PRESIDENTIAL argument has possessed as a lot impact on a political election as that between Joe Biden and Donald Trump on June 27th. Mr Biden's performance was so tragic that his very own event pressed him to quit. Given That Kamala Harris, the vice-president, substituted him as the Democrats' nominee the race has actually secured. It is now a toss-up, according to The Economist's style. On September 10th Ms Harris will encounter Mr Trump in a second governmental dispute. How much distinction will this create?