Over little more than a week, former President Donald Trump survived an assassination attempt, President Joe Biden decided not to seek another term and Vice President Kamala Harris became the de facto Democratic nominee in his stead. And amid the churn, a new focus group of a key set of potential swing voters — supporters of Nikki Haley in the 2024 primaries — shows just how hardened voter views of the 2024 election are.

Those who applauded Trump for adopting a conciliatory tone in the…