You don’t understand this? Sad. Taking care of the cure will make our economic problems much worse. Pretty obvious. Check the numbers, Biden is steady at about 51%, Sanders is steady at about 31%. Biden leads Trump in critical states more than Sanders does. Sanders has a political position and public responsibilities, as does Cuomo, Biden has a moral responsibility not to insert himself into the government processes, just to make political hay.

Your analysis of the “poll of polls” is suspect. Sanders held the left lane of the Democratic party pretty firmly, he still does. In Iowa and New Hampshire he held steady at about 25%, Buttegeig and the the other “moderates” held about 65%. When the moderate wing consolidated around Biden their total percent didn’t move much, Sanders picked up a little from Warren, and set up at about 30%, where he remains. Little about this predictable aggregation of the left and the more moderate voters around two candidates is either surprising or particularly fluid.