I guess they are trying to trap her and she doesn't want to get stuck in a trap, but a reporter asked Kamala Harris if she was ready to be President and her answers were very canned "Joe Biden is our nominee" and "I am proud to be Joe's running mate".
I feel like she could say a lot more, but I think people would at least try to spin it as her seizing a moment and being over-ambitious. Wording and delivery would have to be very careful, I guess. But the points to cover are "I ran for President in 2020 and I was serious about it. I believe that I was prepared to be President of the United States then and I reaffirmed that when I agreed to be Joe's running mate that year and this year. I am proud to be working with Joe Biden and I support him. He's our nominee. But, yes, it is the responsibility of the Vice President of the United States to be ready to be President. That is my job and I am prepared."