More precisely, during Joe Biden's term, he seemed to have failed to gain the trust of the people and the benefits behind him, his support was only at a relative level, instead of fiercely competing with strong opponents, he chose the wise strategy of supporting someone with the ability. And of course with two names Trump and Kamala Harris, it is difficult for him to side with his old opponent. Another problem is that Donald Trump will often be very strong in supporting and attracting voters, but the results in return are often not favorable, which makes us doubt that the presidential seat may belong to Kamala Harris.