 I admire, I respect, I love Joe Biden. I have worked my heart out for him on this campaign. And while this was a very hard decision, I deeply respect how it is a continuation of his lifetime of putting our country before himself. Kuhn says he does not expect a serious challenge to Vice President Kamala Harris's nomination to be the Democrats' candidate for president. But he said that will play itself out over the next few weeks ahead of the Democratic National Convention in Chicago in August.