Two complicating factors: Obama was an unpopular president for long stretches of his time in office and most of the major components of the ACA polled much better than "Obamacare" did.
That’s kind of what I was getting at. 80% of people might approve of The Preexisting conditions clause (or Single Payer) but don’t approved of Obamacare (or Medicare for all) and then a different number might
Approve of candidates that espouse those ideas. Someone can theoretically approve of Medicare for all but vote for Biden because “it’s more realistic” or “we need someone that can beast Trump”
I’d like to say it’s because voters are picking up on some nuance to the different laws... but let’s be realistic, they are large not.
I would be curious to see how Obamacare approval and Obama correlate.
