.NO PRESIDENTIAL DEBATE has possessed as much effect on an election as that between Joe Biden as well as Donald Trump on June 27th. Mr Biden's performance was so devastating that his very own event pressed him to leave. Considering That Kamala Harris, the vice-president, changed him as the Democrats' candidate the nationality has secured. It is right now a toss-up, depending on to The Economist's version. On September 10th Ms Harris will certainly experience Mr Trump in a 2nd presidential argument. How much distinction will this set make?