.NO PRESIDENTIAL controversy has actually had as much influence on a vote-casting as that in between Joe Biden as well as Donald Trump on June 27th. Mr Biden's performance was therefore unfortunate that his very own celebration pushed him to drop out. Since Kamala Harris, the vice-president, changed him as the Democrats' nominee the race has tightened up. It is right now a toss-up, depending on to The Economist's version. On September 10th Ms Harris will face Mr Trump in a 2nd presidential discussion. The amount of variation will this produce?