We had gotten used to the idea that nothing stuck to Donald Trump. Previous politicians could be brought down by the slightest indiscretion, or fumble in the campaign. But Trump spoke offensively, had been shown to have behaved outrageously, and none of it stuck to him in the slightest. And none of it dented his confidence. But now he's on the back foot, playing serious defence. This time it's different, and it's worth looking at why that is. So let's discuss.