Two weeks ago, Donald Trump was riding high, envisioning a landslide victory against Joe Biden after beating an assassination attempt, briefly proclaiming himself to be a new man, and enjoying a drama-free convention that felt like an early victory party. Days later, of course, Biden euthanized his campaign, elevating his vice president as his presumptive replacement and definitively resetting the table. Trump, who is now at parity in the polls with Kamala Harris, has responded with his own stages of grief: complaining at the unfairness of a new challenger; befuddled by the inability of his campaign to land a punch against Harris; furious at the suggestion, proffered by his own team, that her gains were inevitable; and annoyed at having to clean up J.D. Vance’s messes.