It's only moved by about 5 percentage points. Same for Trump. Same for Obama. Statistically, that's barely above the value for noise.Doesn’t Biden’s fluidic approval rating somewhat refute this?
***EDIT*** Never mind, I looked it up. Biden's has varied by about 7 points total. Trump had about a 15 point swing, Obama was 27, and Bush Jr was 65 points. 36 for Clinton, 60 for Sr.
Biden has only been in for a few months, so you'd expect to see only a small variation. That's OK, then, never mind, that goes against the conventional wisdom.