What bugs me about this poll is that Ras has Barry with a 51% approval rating. Frankly, I find that unbelievable.
If there was a D+4 from D+2 shift in the Rasmussen screen, then all of the change is explained. That would include the increase in approval.
It makes a bit of sense to change that screen in that blue voters are not being polled with their phones/power offline. That would be the rationale for the change.
Where does it say this D+2 —> D+4 shift did take place?