I think we have enough data from AZ in the '16 PRES, AZ-CD '08 SE, and AZ-SEN '18 to see the math here in a potential '20 race of Biden vs Trump regardless of polling organization.
Believe I did some precinct work a Year or Two back on this very subject, just to pull up one link....
https://uselectionatlas.org/FORUM/index.php?topic=288717.msg6145557#msg6145557Now, in the event that DJT is the 'Pub nom in '20 (Which is most likely to be the case excepting legal issues, high crimes and misdemeanors, etc....), it appears difficult for Trump to be able carry places where he is already getting hit hard (Middle-Class & Upper Middle-Class Anglos, Latinos, and Asians within Maricopa County).
Despite the likely heavily Anglo biased nature of this poll and low representation of working-class Latino Voters (Much more Dem than Middle and Upper Income Latinos), it appears that Biden does have something going for him with older Anglos when it comes to an FTF vs Trump.
How much of this is nostalgia, and how much of it is "buyers remorse" combined with a dramatically changing electorate that is much Younger and increasingly Latino-American?
IDK about this crap poll early in the season, but name recognition is def a factor, and many folks will take the red meat for a generic "D" especially after all the crap they perceive as having gone down during the Trump Admin....
Just Sayin' ....