We can blame Democratic leadership all we want but some blame also has to go on the voters. Why did California voters re-elect an out-of-touch 85 year old woman to the Senate in 2018? Why was Democratic voter turnout so abysmal in 2014? Why do Democrats need a jolt to show up in the midterms? (2006 midterms after Bush 43's failures and 2018 midterms after Trump's failures) and so on.
Some of it was being complacent which I hope people have learned from and some of it was not realizing how far the GOP will go to destroy the country. I think a lot of people wrongly felt that the country was "moving forward" under Obama and didn't realize until Ferguson that it's the same as it ever was..
Anyway, the court packing thing is NOT something Biden should be focusing on right now. He needs to win and he ain't winning by giving the news some court headlines to run with... no...
He needs to keep the focus on how poorly Trump handled Covid and healthcare.