The Fox Poll, as has been the case now since they switched firms, has been an outlier and not particularly accurate.
A president with roughly 48% approval will not get 40% of the vote. It's not believable or sound.
Very strange phenomena, but very consistent.
Also, on Fox Polls...
Donnelly+7. Conor Lamb+7. And on and on and on.
How's Senator Donnelly these day?
Find me an election in which the incumbent president had a 48% approval rating and got 40% of the vote.
You can't. You can't find one who lost with a 48% approval, let alone with 40%.