 West Virginia's independent Senator Joe Manchin tells CBS Mornings he will not be switching back to the Democratic Party to launch a possible challenge to Harris' nomination, though he believes a primary process would be best. There's a lot of people that have credentials that could do a great job as new leaders. And again, it would help strengthen, I believe, Kamala and her position too. But that's already been predetermined, so we'll see what happens. And I think it's a mistake.