The moment on the View where she said she couldn’t think of anything she’d do different from Biden (which made lots of undecideds say “four more years of inflation and border chaos!”), and then said she’d put a Republican on her cabinet (which made lots of progressives say “both sides are the same!”) really epitomized her problem.
Among other things, she should have just thrown Biden right under the bus and gone with a campaign message of “anything you didn’t like about the last four years was his fault and I’m gonna fix it (“how?” “It’s complicated, here’s a fifty page policy brief you’ll never read.” “I like how prepared you seem!”), anything you did like about the last four years was me pushing Biden to do good.” Like, I personally would have been more enthusiastic about my vote for her if she was more progressive, but I actually don’t know if she needed to be, she just needed to get on board with the premise that most people wanted something “better” (different) than Biden and then define “better” to be whatever she was proposing.