What did he do? I wasn't able to catch the debate and I don't have time today to find it online. Personally, I do not favor Biden and will not be voting for him in the primary. He has the same, imo, problematic old, white man outlook/experiences of life that doesn't allow him to see past his own nose into the experiences of others that don't look like him. He has his temperamental issues as well, which I find ironic being a point against him in the age of Trump, yet in this case still has a bearing upon his readiness to lead.
He still has the lead in a fair number of polls with Sanders being close, and in some cases tied, and Warren nipping at their heels. Clearly, he must appeal to a large enough demographic to maintain that even with the Trump attacks to smear his son, by extension, using a foreign power. I do think a lot of that may just be name recognition and goodwill from the fact that he served under Obama.
Though some people like to claim that he, and others, would be just status quo, or worse I recognize that we have a new status quo. One in which we steal children and reward political donors with huge contracts to imprison and dehumanize their parents. One in which every institution is being broken with deliberation, the courts are being completely overhauled and not just with normal Republican-favoring judges but with unqualified ideologues intent upon rolling back and and all hard won changes that have been made in the arena of civil rights, consumer protections, religious liberties as well as a continuation of economic issues designed to keep those with the money both in charge and controlling our political system. One in which potus attacks large swathes of people among us inciting madmen to violence. One in which every agency designed to protect the American people has been polluted by those who wish to destroy them.
Obviously, if I had to, I would vote for him against Trump in a second, no matter that he doesn't put a fire in my heart. I cannot imagine him continuing these attacks upon our institutions and people. Do you think that he has the political capitol, heart to be able to undo some of the damage that has been done as well as appoint the right people who can assist in that effort?