Be careful interpreting polls. Question wording bias is very powerful. If you ask them whether they’d be willing to pay higher taxes for Medicare for all, it’d much less popular. Just like how a huge majority support renewable energy in surveys, but the same overwhelming majority refuses to pay even 5% more for electricity.
Which only shows that opinion on these issues is malleable and not ideologically-fixed, as many would like to portray them. Understanding your constituency and being successfully persuasive is a fundamental part of any politics.