My answer to those arguments would have been to nominate Bernie Sanders in 2016 and 2020. The American left has not been represented in the last 3 cycles but in this current one, Biden had still done far better than Trump on the metrics Bill Maher and others claim to be most important.
What has really been rejected in these elections has been tweak around the edges centrism. Trump in 2016 argued against foreign wars, for single payer healthcare(!), protecting jobs etc etc. Hillary really did just run on her identity and appeared entitled and in support of the status quo. I could see very clearly how he had a route to winning that time.
Nancy Pelosi has blamed Biden for not standing down, but the truth is a centrist would most likely still have been nominated anyway with a similar result. A Tim Walz style progressive with a record in government should be the next nominee in my view, with a platform centred around universal healthcare.
It was rejected at the election BSB. Harris and Walz are progressives and not only did they lose the presidential vote, they lost the popular vote, the senate and the house. As the FT article/mayer were saying the democrats have tried to move further left and it hasn’t gone well. The U.S. is a centre right, conservative (small c) country