 Biden's debate performance sparked concern within the party about his mental competency at the age of 81. And this week, a positive COVID test amplifying those concerns. With the president now isolating at home in Delaware, Vice President Kamala Harris is on the campaign trail. In recent days, they've been trying to portray themselves as the party of unity. But here's the thing. Here's the thing. If you claim to stand for unity, you need to do more than just use the word.