In 2016 American voters did not know whom they were getting. Now they do. They would be voting for division and lying. They would be endorsing the trampling of norms and the shrinking of national institutions into personal fiefs. They would be ushering in climate change that threatens not only distant lands but Florida, California and America’s heartlands. They would be signalling that the champion of freedom and democracy for all should be just another big country throwing its weight around. Re-election would put a democratic seal on all the harm Mr Trump has done.