Liberal democracies are rarely overthrown, but frequently corrupted. Vanquishing a democracy outright is difficult, and is likely to provoke fervent opposition. But you don’t need to end free elections if you can create a playing field so un-level that your opponents are highly unlikely to win. This model has become so common, in states such as Hungary, Poland and Turkey, that it has a name – ‘illiberal democracy’. It’s becoming increasingly clear that President Trump, and some of those around…