And Gallup is not showing their internals..no breakdown of what Americans they polled. How many Rep, Dem, and Ind - registered voters vs likely voters.
You can poll 1500 “Americans” in the same demo to get the result you like.
I think you need to subscribe to their Gallup Analytics service to get those.
They do let you download a PDF here that describes their methodology. According to them, while they do collect Party ID they don't weight their polls based on that so on any given day it could be skewed one way or another.