 Democratic voters had this intense focus on beating Trump because they saw him as an existential threat to the country. And they settled on Biden as the most electable candidate in the field, the most able to beat Trump. That's exactly what he did. But after that very bad debate performance, many Democrats have become convinced that Biden simply can't win, that he's too old, that he doesn't have enough fight. And now more than ever, they still see Trump as a threat.