Biden is pretty centrist and is not willing to go for universal healthcare, whereas the Bernie side of the spectrum explicitly campaigned for this. That's one of the examples.
A very clear majority of Americans support universal healthcare every time they are polled about it. This isn’t the radical agenda that you seem to be claiming it to be, it’s about bringing the US system to be closer in line with what every other first world nation has already had for decades.
A majority of Americans also reject tax increases on their incomes, and this program is very expensive: A majority Republicans and Republican-leaning voters reject the notion that the Government should provide overall coverage. Roughly 37% overall do not want this at all.
Interestingly, Pew only asked the question of what the public wants, but not how much things cost and how they will be paid for. As always, the devil is in the details: Roughly 53% do not support raising income taxes on incomes above 250,000!
It's clear that when we are asked whether we want something and then also asked if we want to pay for it via higher taxes, we have balked. Ultimately, if folks are not willing to pay for something, they can't have it! And if they are unwilling to pay for something, they're effectively saying they don't want it.
