There's a huge DISINFORMATION campaign afoot. I've seen numerous "finally" posts which would suggest that Jeffries hasn't come out with his support before now. If they listen keenly to his current response they would hear him somewhat chastise the media for questioning his stance on this situation more than once.
In a thirst for ratings through chaos and other nefarious reasons. The American media is complicit in conducting PSYOP against the American people and now even the Democratic base is in a state of confusion and questioning our know knowledge and judgment. We are being GASLIT. I've seen many "if this politician feels this way then something must be wrong because they know more than I do" posts. No. Let us use our own judgment. We have seen the president. We know of his history (he has a speech impediment and he makes gaffes at times). Others in the outside world have also dealt with him. What about the other Democratic politicians who gave him their support, haven't they been presented with the same "secret information"? Assess the totality of the information provided. The president has dealt with other world leaders. Have we heard ANY suggestions from the outside that he is not functional and is declining cognitively? I have seen many world leaders praise President Biden including Netanyahu while they're at odds with each other.
This is 2016 on steroids and even though we have talked a good talk, we (the Democratic politicians and base) were not prepared. WE ARE BEING LIED TO.
I believe the catalyst behind the dissent is money. The donor class has threatened to pull their support for those who back Biden. The dissenters have given Biden an even stronger populous message.