.NO PRESIDENTIAL DEBATE has actually possessed as a lot influence on an election as that between Joe Biden as well as Donald Trump on June 27th. Mr Biden's performance was thus dreadful that his very own event pressed him to leave. Given That Kamala Harris, the vice-president, changed him as the Democrats' candidate the race has actually tightened up. It is currently a toss-up, according to The Economist's model. On September 10th Ms Harris will definitely deal with Mr Trump in a second presidential argument. Just how much difference will this set help make?