.NO PRESIDENTIAL dispute has had as much impact on a vote-casting as that in between Joe Biden as well as Donald Trump on June 27th. Mr Biden's efficiency was actually therefore tragic that his own party pressed him to leave. Given That Kamala Harris, the vice-president, replaced him as the Democrats' candidate the race has tightened. It is now a toss-up, depending on to The Economist's style. On September 10th Ms Harris will definitely face Mr Trump in a second presidential dispute. How much variation will this produce?