.NO PRESIDENTIAL controversy has had as much effect on a political election as that in between Joe Biden and Donald Trump on June 27th. Mr Biden's efficiency was actually therefore devastating that his own gathering pushed him to drop out. Given That Kamala Harris, the vice-president, replaced him as the Democrats' nominee the nationality has secured. It is now a toss-up, according to The Economist's design. On September 10th Microsoft Harris will deal with Mr Trump in a 2nd governmental discussion. The amount of difference will this help make?