Then again, no one actually ever believed that Obama walked away with 60% Approval. Really? 60% Of all Legal Americans approve of N.Korea and Iran acquiring/possessing nukes intended for us? While during the Obama years, Barry didn't do anything to stop the madness?
A Hillary Clinton administration would have been a carbon-copy continuation of Obama's foreign and domestic policies. The 2016 was a referendum on Obama's policies and a possible continuation of his policies so yes, I would also doubt that Obama's approval rating really was that high.
Those pesky polls, you know: They don't tell us what we believe, they tell us what we should believe.