It would seem as if their approach is to simply pivot, and act like they knew all along about his cognitive challenges (despite telling everyone they were just buying into right-wing propaganda by talking about Biden's challenges), put emphasis on "Felonies are worse than a president having Alzheimer's", while simultaneously nudging in the direction of having the DNC replace Biden with someone else.
It was just 3 months ago when MSNBC were running pieces like this:
"This version of Biden... Intellectually, analytically, is the best version of Biden we've ever seen"
Clearly the left-leaning media outlets/pundits aren't terribly confident in the notion of the public agreeing with them about "which is worse", otherwise, we'd still see them rallying around Biden instead of Van Jones saying "That was painful to watch, it's not too late for the DNC to change course", or CNN having a piece on in which Jake Tapper said:
“There is a pattern, a discernible pattern, of Democratic officials seemingly trying to convince you, the public, to not believe what you saw and what you heard with your eyes and with your ears on Thursday night,”
and then went on to say...
“The spinning is all very reminiscent of the George Orwell quote from the book 1984. It’s relevant again today. ‘The party told you to reject the evidence of your eyes and ears. It was their final, most essential command.’”
Jake Tapper saying something on TV that if this were 2 months ago, and people only knew the quote and that is was about Biden's mental fitness, if we asked "Which pundit said this?", people would've guessed that it was Jessie Watters over on Fox News.
I'm sure there are some who remember the Louisiana Gubernatorial election in which Edwin Edwards ran against David Duke, and the slogan of the Democrats became "Vote for the Crook, it's important". If they truly felt the same way about this situation, the media would be saying "Vote for the doddering old man, it's important", instead of saying "C'mon DNC, it's not too late to replace the old man with someone better".
I think the fact is, they know that not all voters (even some voters from their own party) see felony convictions as a stand-alone dealbreaker. It certainly wasn't a dealbreaker for Marion Barry (who came back and won both a city council seat, and a subsequent 4th term as DC Mayor after his convictions.
I've been saying for 6 months now (and you can easily go back and find it in my old posts) that the DNC should've been making arrangements for Biden to step away, and have Gavin Newsom or Jared Polis to take the baton if they really wanted to avoid a 2nd Trump term.
I even posted several "compare and contrast" videos showing him speaking and debating in the 1980's up through 2012, and then compared that what we're seeing now to highlight the decline.
Those suggestions/posts got me regularly accused of "Ageism", or people deflected and attributed it to the fact that he used to have a stutter (the kind of stutter that apparently disappears when you're sixteen, is nowhere to be found for 62 years, and then magically makes a comeback)
It would appear that at least some of the CNN pundits have "come around" to my way of thinking on this.