Democrats feel doomed. What’s the least risky move?

With falling poll numbers and President Biden's public appearances doing little to reassure voters he’s still got what it takes to win, Democrats are faced with a difficult decision about how to proceed. Biden has dug in, pledging to the public that he isn’t going anywhere. Charles Lane, Karen Tumulty and Perry Bacon Jr. talk through whether Biden can salvage his campaign, how possible it really is to change course now and who else could step up.Read more from our columnists:“Kamala Harris walks into the storm — and keeps her footing”“What if Biden steps aside from the Democratic nomination?”“If not Biden, who? Five columnists weigh in.”