There is a familiar moment in Republican electoral politics when an obscure politician thrust into the limelight during election season comes under intense public scrutiny and is found to be not quite as first impressions suggested. This was Sarah Palin in 2008, or Ben Carson in 2016, and the inflection point is the moment at which the supposedly promising new face shades into what Mitch McConnell once delicately referred to as the Republicans’ “candidate quality problem”. Or, as most of us know it colloquially, the moment we realise: oh, this person is unhinged.