Blueprint recently tested the effectiveness of several closing messages for the Harris campaign and this was found to be the best:
Nearly half of Donald Trump’s Cabinet have refused to endorse him. When Trump learned during the Capitol riot that his supporters were threatening to kill his own vice president, he said ‘so what?’ and refused to do anything to assure the vice president was safe. Republican governors, senators, and House members have all said the same thing: We can’t give Trump another four years as president.
Bill Kristol: “As soon as the message turned from an abstract argument against Trump into an unambiguous case that Trump’s own former allies were making against him, it became the single most persuasive line tested by Blueprint. It was stronger even than abortion rights and Social Security. In other words, hearing about Trump’s unfitness from people who worked with him, and from Republicans one would expect to defend him, seems to make a difference.”
“I think the takeaway here is pretty obvious: Voters have become inured to many shocking things about Trump, but maybe the one thing that can shake them out of that torpor is people who knew or worked with Trump stepping up to make the case from their own experience. The messenger matters as much as the message.”