.NO PRESIDENTIAL dispute has had as much impact on an election as that in between Joe Biden and also Donald Trump on June 27th. Mr Biden's functionality was actually so unfortunate that his own party pressed him to quit. Since Kamala Harris, the vice-president, changed him as the Democrats' nominee the race has actually firmed up. It is actually now a toss-up, according to The Economist's design. On September 10th Ms Harris will certainly deal with Mr Trump in a second presidential debate. Just how much distinction will this set produce?